Pearson et al. BMC Public Health 2014, 14:553
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RESEARCH ARTICLE
Open Access
Associations between neighbourhood
environmental characteristics and obesity and
related behaviours among adult New Zealanders
Amber L Pearson1*, Graham Bentham2, Peter Day3 and Simon Kingham3
Abstract
Background: The prevalence of adult obesity is escalating in most wealthy and middle income countries. Due to
the magnitude of this issue, research and interventions at the individual-level abound. However, the limited success
and high costs of such interventions has led to a growing recognition of the potential role of environmental factors
in reducing obesity and promoting physical activity and healthy diets.
Methods: This study utilised individual-level data from the 2006/7 New Zealand Health Survey on obesity, physical
activity, diet and socio-economic variables linked to geographic information from other sources on potentially
aetiologically-relevant environmental factors, based on the respondent’s residential address. We fitted logistic
regression models for eight binary measures of weight or weight-related behaviours: 1) overweight; 2) obesity; 3)
overweight + obesity; 4) active at least 30 minutes a day for 5+ days per week; 5) active <30 minutes per week; 6)
walk 150 minutes + per week; 7) walk <30 minutes per week; and 8) consumption of 5+ fruits and vegetables per
day. We included a range of independent environmental characteristics of interest in separate models.
Results: We found that increased neighbourhood deprivation and decreased access to neighbourhood greenspace
were both significantly associated with increased odds of overweight and/or obesity. The results for weight-related
behaviours indicate that meeting the recommended level of physical activity per week was associated with urban/rural
status, with higher activity in the more rural areas and a surprising tendency for less activity among those living in areas
with higher levels of active travel to work. Increased access to greenspace was associated with high levels of walking,
while decreased access to greenspace was associated with low levels of walking. There was also a significant trend
for low levels of walking to be positively associated with neighbourhood deprivation. Results for adequate fruit
and vegetable consumption show a significant urban/rural gradient, with more people meeting recommended
levels in the more rural compared to more urban areas.
Conclusion: Similar to findings from other international studies, these results highlight greenspace as an amenable
environmental factor associated with obesity/overweight and also indicate the potential benefit of targeted health
promotion in both urban and deprived areas in New Zealand.
Keywords: Obesity, Built environment, Neighbourhood, New Zealand
Background
In 2013, Mexico surpassed the United States with about
one-third of its adults estimated to be obese [1]. However, the United States [2], the United Kingdom, New
Zealand and other wealthy countries are not far behind
and are on upward trajectories. The prevalence of adult
* Correspondence: amber.pearson@otago.ac.nz
1
Department of Public Health, University of Otago - Wellington, 23A Mein
Street, Wellington 6242, New Zealand
Full list of author information is available at the end of the article
obesity in New Zealand is high (28% in 2011/2) and rising
(from 26% in 2006/7) [3], leading to escalating health care
costs, especially for associated conditions such as Type II
diabetes. At its most basic, obesity results from a positive
balance between energy input from food and drink and
energy output from basic metabolic processes and from
physical activity, with excess calories being stored as body
fat [4]. Due to the magnitude of this health issue and the
myriad diseases related to obesity, research to understand
© 2014 Pearson et al.; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative
Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and
reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain
Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article,
unless otherwise stated.
Pearson et al. BMC Public Health 2014, 14:553
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behaviour, genetics, surgery or drug therapies to reduce or
prevent obesity have been widespread [5-8]. Most interventions have focused on individuals, targeting behaviours
related to diet and physical activity, or the use of antiobesity drugs, or, in extreme cases, bariatric surgery. The
limited success and high costs of such interventions has
led to a growing recognition of the importance of obesity
at a population-level and the role of supply side interventions [9] and amenable environmental factors in obesity,
particularly those that encourage higher levels of physical
activity and healthy diets [10].
Evidence of individual-level risk factors for adult obesity
include childhood obesity [11], income, education [12]
and interactions in risk by age, sex and ethnicity [13] most
likely related to varying behaviours and diet [9]. While
behaviours and diet are important direct risk factors for
obesity, it is the environments in which individuals
reside which may play a large role in such risk factors.
With the exception of neighbourhood deprivation, studies
have had mixed results when using GIS-based measures
to capture neighbourhood environmental variables which
may promote or hinder the maintenance of a healthy
weight for residents measured against both individual
and population level obesity or weight-related behaviours
[14,15]. These GIS-based exposure measures include
proximity of supermarket, density or type of food outlet,
neighbourhood ‘walkability’, landuse, greenspace, and population density. Outcome measures include BMI, obesity
status, and weight-related behaviours such as fruit/vegetable consumption and physical activity. For example,
findings are inconsistent in terms of the role of access to
fresh fruits and vegetables on healthy weight. Accessibility
of fruits and vegetables was positively associated with
increased consumption in most, but not all, of the studies
in the USA and Norway [16-19]. Studies found inconsistent associations between consumption and the establishment of food outlets in the United Kingdom [20,21]. In
New Zealand, geographic access to supermarkets was
better in deprived neighbourhoods than affluent neighbourhoods, but access was not associated with individuals’
vegetable intake [22]. A recent review of the evidence to
support a link between access to greenspace and weight
reported that almost 70% of studies found a positive or
weak association between greenspace and obesity-related
health indicators. However, the review concluded that
findings varied by age of study participants, socioeconomic status and the geographic measure of greenspace
used [23]. Another important obesity-related focus of
neighbourhood-based research is the role of the built
environment in promoting physical activity. Sallis et al.
have put forward key findings and recommendations to
modify these features in order to increase physical activity. Specifically, this report emphasizes proximity to
recreation facilities and access to active transportation
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[10]. Internationally, the findings are much more consistent for neighbourhood socio-economic status or
deprivation and weight-related outcomes. The Whitehall studies in the United Kingdom (UK) showed strong
associations over time with BMI in women regardless
of individual income, age, smoking status, alcohol intake,
or physical activity level [24]. Similar results were found
for both men and women in the Netherlands. Even after
adjustment for education, age and sex the odds ratios
of overweight increased significantly by increasing neighbourhood deprivation [25].
Despite much of the international evidence finding
associations between neighbourhood characteristics and
obesity, the current evidence-base in New Zealand for
guiding the design of interventions in obesogenic environments is sparse. This study, therefore, aimed to understand
the potential influence of neighbourhood environments on
both unhealthy weight outcomes (overweight and obese)
and weight-related behaviours (walking, physical activity
levels and fruit and vegetable consumption). To our knowledge, this is the first study in New Zealand to evaluate the
potential role of environmental characteristics in influencing individual-level obesity/overweight, adding to evidence
from the USA, Australia, Canada and Europe [15].
Methods
The study is based on individual-level data from the 2006/
7 New Zealand Health Survey (NZHS) on obesity, physical
activity including walking and diet [26] linked to geographic information from other sources on potentially
aetiologically-relevant environmental factors, based on the
respondent’s residential address at the time of the survey.
Health data
The 2006/07 NZHS was conducted from October 2006
to November 2007. Data were collected for 12,488 adults
aged 15 years and over (response rate of 68%) [26]. The
NZHS is a key component of national health monitoring
by the New Zealand Ministry of Health and is designed to
be a nationally-representative sample of New Zealanders.
This survey used a multi-stage, stratified, probability proportionate to size sample design, with increased sampling
of some ethnic groups. A full description of the sampling
design is available onlinea. In brief, small geographic areas
(meshblocks) were randomly selected and interviewers
began at a random point in each meshblock and selected
every kth house for enrolment of one adult aged 15 years
and over. Interviews were conducted in participants’
homes, at a time to suit participants. Height, weight and
waist measurements were taken using professional weighing scales, a portable stadiometer, and an anthropometric
measuring tape.
For our research purposes, the NZHS health and behavioural end-points of interest were: 1) Body Mass
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Index (BMI) values and as internationally recognised
categories of overweight; 2) obesity; 3) and either overweight or obesity; 4) Whether the individual meets the
recommendation of at least 30 minutes per day of moderate/vigorous physical activity on at least 5 days in a
week [27]; 5) Whether the individual had 30 minutes or
less per week of moderate/vigorous physical activity as a
measure of sedentary behaviour [26]; 6) Whether the
individual walks at least 150 minutes in a week, as walking has long been recognised as an important low to
moderate form of physical activity [28]; 7) Whether the
individual walks <30 minutes per week as a measure of
sedentary behaviour [26]; and 8) Whether the individual
consumes 5 or more portions of fruit and vegetables per
day as recommended by the United States Department
of Agriculture and other agencies [29].
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walk 150 minutes + per week; 7) walk <30 minutes per
week; and 8) consumption of 5+ fruits and vegetables
per day. Each model was first fitted unadjusted (i.e., each
neighbourhood environmental factor one at a time for
each of the dependent variables). Next, each model was
fitted adjusted for individual-level confounders. Last,
models were fitted for each dependent variable including
all environmental factors as independent variables and
adjusted for individual-level characteristics. We included
the independent environmental characteristics of interest
(quintiles) as continuous variables to provide tests of
trend and as discrete categories for which adjusted Odds
Ratios (ORs) and 95% confidence intervals were calculated. All models are fitted using Stata v11 (College Station, TX, USA) with adjustment for the complex sample
design of the NZHS, which produced cluster robust
estimates.
Neighbourhood environmental characteristics data
We compiled geographic data for a number of neighbourhood characteristics, posited as important environmental
influences in previous research (Table 1). Drawing on the
framework outlined by Sallis et al. [10], the environmental
characteristics in this study included aspects of the built
environment (e.g., food outlets [30] and green space
[31]) and the social/cultural environment (e.g., area-level
deprivation [3]). The number of variables was limited
and all continuous variables were converted to quintiles
(1 = best access and 5 = worst access) because of a New
Zealand Ministry of Health requirement for maintaining
confidentiality. The selected neighbourhood variables were
then linked, by the Ministry of Health, to the individuallevel NZHS responses by the residential address at the
time of the survey and then addresses were removed
for anonymity prior to analyses. Some variables were
measured at the meshblock level (average 2006 population ~ 100), which is the smallest unit of aggregation in
New Zealand. Others were measured at the census area
unit (CAU) level (average 2006 population ~2500),
which is the next larger unit of aggregation and usefully
approximates a neighbourhood in urban settings.
Potential confounder data
The NZHS also provides data at the individual-level on
potential confounders/effect modifiers, including age,
sex, ethnicity, Economic Living Standard Index [36],
individual-level deprivation (NZiDep) [37], highest educational qualification, household composition, smoking
status and alcohol consumption.
Statistical analyses
Separate logistic regression models were fitted for eight
binary dependent variables: 1) overweight; 2) obesity; 3)
overweight + obesity; 4) active at least 30 minutes a day
for 5+ days per week; 5) active <30 minutes per week; 6)
Results
The majority of respondents were classed as either overweight or obese (65%) and the percentage of overweight/
obese males was higher than females (70% and 60% respectively) (Table 2). Younger respondents had lower
levels of overweight and obesity. Among ethnic groups,
over 90% of Pacific respondents were classed as overweight/obese and 68% classed as obese. The Asian respondents had the lowest levels of overweight/obesity,
with only 11% classed as obese.
The results of our fully-adjusted regression analyses
(Model 3), where the ORs represent tests of overall
trends, indicate that overweight, obesity and overweight +
obesity status were each associated with increased
deprivation and lower access to greenspace (Table 3).
Table 4 include the results of regression analyses,
where the ORs represent comparisons with the reference
categories, for weight status outcomes. For the fully adjusted model which included overweight as the
dependent variable, the highest deprivation category was
significantly associated with increased odds of being
overweight (OR = 1.34, p = 0.018) compared to the least
deprived group. Similarly, overweight status was significantly associated with decreased access to greenspace
for each access category, except category three, compared to the reference category (best access).
For the model which included obesity as the
dependent variable, the highest deprivation category was
also significantly associated with increased odds of being
obese (OR = 1.56, p = 0.001) compared to the least deprived group. Also, the two lowest levels of access to
greenspace were significantly associated with increased
odds of being obese (OR = 1.30 and OR = 1.42, p < 0.033)
compared to the highest level of access. The second and
the highest levels of access to foodshops were significantly associated with decreased odds of being obese
Characteristic
Description
Source (Year)
Descriptive statistics*
Urban/rural category
CAU ranking 1 to 4, where 1 = most urban
Statistics New Zealand (2006)
Min = 1, 25th percentile = 1, Mean = 1.4,
Median = 1, 75th percentile = 1, Max = 4
Area-level deprivation (NZDep)
NZDep 2006 quintiles for meshblocks, where 1 = least deprived
Salmond (2006) [32]
Min = 1, 25th percentile = 2, Mean = 3.2,
Median = 3, 75th percentile = 5, Max = 5
Accessibility of useable greenspace
Proportion of meshblock consisting of useable greenspace,
as qunitles where 1 = best access
Richardson (2005) [33]
Min = 1, 25th percentile = 2, Mean = 2.9,
Median = 3, 75th percentile =4, Max = 5
Accessibility of food outlets
Distance from meshblock population-weighted centroid to nearest
outlet (supermarkets, fast-food outlets, convenience stores),
as quintiles where 1 = nearest
Territorial Authorities (2005) [34]
Min =1, 25th percentile = 2, Mean = 2.8,
Median = 3, 75th percentile = 4, Max = 5
Accessibility of sports/leisure facilities
Distance from population-weighted centroid of meshblock to
nearest gym, pool, karate, recreation centre, as quintiles where
1 = nearest (excludes biking/hiking trails)
ACC Pool Safety (2005) [35]
Min = 1, 25th percentile = 2, Mean = 2.8,
Median = 3, 75th percentile = 4, Max = 5
Percentage active transport to work
Proportion of CAU adult residents who walk, bus or cycle to
work, as quintiles, where 1 = least
Statistics New Zealand (2006)
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Table 1 Sources and descriptions of neighbourhood environmental characteristics data
Min = 1, 25th percentile = 2, Mean = 3,
Median = 3, 75th percentile = 4, Max = 5
*Calculated only for areas where health survey participants resided.
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Table 2 Demographic characteristics of respondents, by
weight status
n
% overweight
% obese
% overweight
or obese
All
12488
37.1
27.5
64.6
Females
7215
31.3
27.9
59.2
Males
5273
43.1
27.1
70.2
Age 15-44
6320
33.6
23.9
57.5
Age 45-64
3808
39.2
32.8
72.0
Age 65+
2360
43.9
27.7
71.6
Māori
3160
31.9
45.0
76.9
Pacific
1033
23.1
67.7
90.8
European
8519
39.1
25.5
64.6
Asian
1513
31.5
11.0
42.5
Other
87
31.0
16.4
47.4
(ORs 0.75 or lower, p < 0.05) compared to the lowest
level of access.
For the model which included overweight or obesity as
the dependent variable, similar trends were observed for
deprivation, where those living in the most deprived
neighbourhoods had significantly increased of being
overweight/obese. Decreased access to greenspace also
exhibited increased risk in all but one level of access,
compared to the best access level.
The results of our fully adjusted regression (Model 3)
analyses for meeting the recommended level of physical
activity per week, where the ORs represent tests of
overall trends, only two environmental variables remain
significantly associated: 1) urban/rural status, with substantially more people meeting recommended standards
of physical activity in the more rural areas than in the
more urban areas; and 2) a significant and surprising
tendency for fewer people to meet the recommended
standard in areas with higher levels of active travel to
Table 3 Associations (tests of trend) between overweight, obesity, overweight + obesity and environmental factors
MODEL 1
MODEL 2
MODEL 3
(Run separately for each
environmental factor)
(Run separately for each
environmental factor)
(All environmental
factors included)
Unadjusted
Adjusted
individual factors
Adjusted individual factors
and environmental factors
OR
95% CI
p-value
OR
95% CI
p-value
OR
95% CI
p-value
Urban/rural
1.11
1.03,1.19
0.004
1.01
0.94,1.09
0.735
1.01
0.89,1.15
0.843
NZdep
1.01
0.96,1.06
0.688
1.05
1.00,1.11
0.043
1.06
1.00,1.12
0.034
Greenspace
1.08
1.03,1.13
0.001
1.04
1.00,1.09
0.073
1.05
1.00,1.11
0.041
Foodshop
1.06
1.01,1.10
0.017
1.00
0.95,1.05
0.981
0.99
0.93,1.07
0.880
Gym/pool
1.10
1.06,1.15
0.000
1.02
0.98,1.07
0.374
1.02
0.95,1.09
0.533
Active travel
0.93
0.89,0.97
0.001
0.98
0.93,1.02
0.282
0.97
0.92,1.03
0.322
Urban/rural
1.16
1.08,1.25
<0.001
1.08
1.00,1.17
0.060
1.07
0.93,1.22
0.361
NZdep
1.23
1.16,1.30
<0.001
1.13
1.07,1.20
<0.001
1.11
1.05,1.18
0.001
Greenspace
1.14
1.09,1.20
<0.001
1.09
1.04,1.15
0.001
1.08
1.18,1.15
0.007
Overweight
Obesity
Foodshop
1.02
0.97,1.07
0.523
0.98
0.93,1.03
0.429
0.94
0.88,1.02
0.137
Gym/pool
1.17
1.11,1.23
<0.001
1.06
1.00,1.11
0.042
1.06
0.98,1.15
0.143
Active travel
0.89
0.85,0.94
<0.001
0.97
0.92,1.02
0.217
0.97
0.91,1.03
0.314
Urban/rural
1.13
1.06,1.20
<0.001
1.08
1.00,1.17
0.060
1.04
0.92,1.17
0.525
NZdep
1.10
1.05,1.16
<0.001
1.13
1.07,1.20
<0.001
1.08
1.02,1.13
0.004
Greenspace
1.10
1.06,1.15
<0.001
1.07
1.02,1.11
0.003
1.07
1.01,1.22
0.005
Foodshop
1.04
1.00,1.08
0.069
0.98
0.93,1.03
0.429
0.97
0.91,1.03
0.320
Gym/pool
1.13
1.09,1.18
<0.001
1.06
1.00,1.11
0.042
1.04
0.98,1.11
0.217
Active travel
0.91
0.87,0.95
<0.001
0.97
0.92,1.02
0.217
0.97
0.92,1.03
0.315
Overweight + obesity
Note: Categories: Urban/rural: 1 = Main urban area; 2 = Secondary urban area; 3 = Minor urban area; and 4 = Rural area. Environmental variables: quintiles (1 = best
access, 5 = worst access); Deprivation (NZdep) (1 = least deprived, 5 = most deprived).
All bolded values are statistically significant at the 0.05 level.
Category 1
Category 2
Category 3
Category 4
OR
95% CI
p-value
OR
95% CI
p-value
OR
95% CI
Category 5
p-value
OR
95% CI
p-value
p trend
Overweight
Urban/rural
Reference
0.82
0.64,1.05
0.113
0.99
0.70,1.42
0.970
1.16
0.77,1.73
0.478
NZdep
Reference
1.19
0.98,1.44
0.078
1.10
0.89,1.34
0.378
1.21
0.97,1.49
0.089
1.34
1.05,1.72
0.018
0.034
0.843
Greenspace
Reference
1.38
1.24,1.68
0.001
1.14
0.93,1.39
0.215
1.32
1.08,1.63
0.008
1.34
1.04,1.73
0.022
0.041
Foodshop
Reference
0.97
0.80,1.18
0.773
0.99
0.81,1.20
0.909
1.04
0.82,1.32
0.753
0.82
0.55,1.18
0.265
0.880
Gym/pool
Reference
0.98
0.81,1.18
0.805
1.01
0.83,1.24
0.892
1.13
0.86,1.47
0.338
1.07
0.79,1.44
0.678
0.533
Active travel
Reference
1.00
0.82,1.23
0.973
1.06
0.85,1.34
0.586
1.03
0.83,1.27
0.811
0.89
0.70,1.13
0.340
0.322
Reference
1.13
0.86,1.48
0.385
1.30
0.87,1.96
0.204
1.09
0.71,1.69
0.688
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Table 4 Association between overweight, obesity, overweight+obesity and environmental factors adjusted for socio-demographic and other
environmental factors
Obesity
Urban/rural
0.361
NZdep
Reference
0.93
0.74,1.17
0.537
1.04
0.82,1.33
0.749
1.18
0.93,1.51
0.177
1.56
1.20,2.04
0.001
0.001
Greenspace
Reference
1.00
0.79,1.26
0.521
0.97
0.77,1.22
0.797
1.30
1.02,1.65
0.032
1.42
1.08,1.87
0.012
0.007
Foodshop
Reference
0.75
0.61,0.94
0.010
0.90
0.73,1.12
0.343
0.79
0.61,1.04
0.088
0.67
0.45,0.99
0.046
0.137
Gym/pool
Reference
0.91
0.74,1.12
0.375
1.23
0.98,1.55
0.073
0.94
0.68,1.30
0.704
1.18
0.83,1.68
0.365
0.143
Active travel
Reference
1.15
0.90,1.48
0.269
1.16
0.88,1.54
0.291
1.10
0.84,1.46
0.485
0.90
0.67,1.21
0.497
0.314
Urban/rural
Reference
0.93
0.74,1.18
0.575
1.13
0.82,1.56
0.460
1.15
0.80,1.65
0.463
NZdep
Reference
1.09
0.91,1.31
0.328
1.06
0.88,1.28
0.547
1.17
0.97,1.42
0.109
1.43
1.14,1.78
0.002
0.004
Greenspace
Reference
1.23
1.03,1.47
0.023
1.08
0.90,1.29
0.433
1.34
1.11,1.61
0.002
1.39
1.10,1.75
0.006
0.005
Foodshop
Reference
0.88
0.74,1.04
0.128
0.94
0.79,1.11
0.437
0.92
0.74,1.14
0.444
0.74
0.53,1.03
0.079
0.320
Gym/pool
Reference
0.96
0.81,1.14
0.675
1.11
0.93,1.33
0.247
1.07
0.83,1.37
0.598
1.11
0.84,1.48
0.455
0.217
Active travel
Reference
1.09
0.89,1.32
0.401
1.12
0.90,1.39
0.313
1.10
0.89,1.36
0.379
0.91
0.73,1.15
0.428
0.315
Overweight+obesity
0.525
Note: Categories: Urban/rural: 1 = Main urban area; 2 = Secondary urban area; 3= Minor urban area; and 4 = Rural area.
Environmental variables: quintiles (1 = best access, 5 = worst access); Deprivation (NZdep) (1= least deprived, 5= most deprived).
All bolded values are statistically significant at the 0.05 level.
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Table 5 Associations (test of trend) between obesity-related behaviours and environmental factors
MODEL 1
MODEL 2
MODEL 3
(Run separately for each
environmental factor)
(Run separately for each
environmental factor)
(All environmental
factors included)
Unadjusted
Adjusted
individual factors
Adjusted individual factors
and environmental factors
OR
95% CI
p-value
OR
95% CI
p-value
OR
95% CI
p-value
1.25
1.17,1.33
<0.001
1.24
1.16,1.32
<0.001
1.12
1.01,1.25
0.038
Active 5+ days
Urban/rural
NZdep
0.99
0.96,1.03
0.777
1.01
0.96,1.05
0.810
1.02
0.97,1.07
0.389
Greenspace
1.07
1.03,1.11
0.001
1.05
1.01,1.10
0.007
0.99
0.95,1.04
0.579
Foodshop
1.09
1.05,1.13
<0.001
1.07
1.03,1.12
0.001
1.02
0.96,1.08
0.399
Gym/pool
1.13
1.09,1.18
<0.001
1.12
1.08,1.17
<0.001
1.00
0.94,1.06
0.942
Active travel
0.93
0.89,0.96
<0.001
0.94
0.90,0.97
<0.001
0.94
0.89,0.99
0.012
Active <30 mins/week
Urban/rural
0.90
0.82,0.99
0.028
0.94
0.85,1.03
0.195
1.06
0.87,1.29
0.548
NZdep
1.18
1.12,1.24
<0.001
1.10
1.04,1.17
0.001
1.07
1.00,1.14
0.051
Greenspace
0.97
0.91,1.02
0.239
0.99
0.93,1.05
0.718
1.02
0.95,1.09
0.473
Foodshop
0.88
0.83,0.93
<0.001
0.93
0.88,0.99
0.028
0.99
0.91,1.09
0.887
Gym/pool
0.92
0.87,0.98
0.007
0.93
0.88,0.99
0.032
0.96
0.88,1.05
0.350
Active travel
1.07
1.02,1.13
0.011
1.06
1.00,1.12
0.047
1.01
0.94,1.09
0.726
Urban/rural
1.12
1.04,1.20
0.002
1.13
1.05,1.21
0.001
1.06
0.95,1.17
0.284
NZdep
1.02
0.98,1.06
0.358
1.03
0.98,1.07
0.235
1.03
0.98,1.09
0.208
Greenspace
0.97
0.94,1.01
0.190
0.97
0.93,1.01
0.133
0.93
0.89,0.97
<0.001
Walk 150+ mins/week
Foodshop
1.03
0.99,1.08
0.140
1.03
0.99,1.08
0.149
1.02
0.95,1.08
0.625
Gym/pool
1.05
1.00,1.09
0.040
1.05
1.00,1.10
0.034
1.00
0.93,1.07
0.930
Active travel
0.98
0.95,1.03
0.452
0.98
0.94,1.02
0.315
0.98
0.93,1.04
0.475
Walk <30 mins/week
Urban/rural
0.99
0.93,1.06
0.788
0.97
0.91,1.04
0.450
0.91
0.82,1.02
0.099
NZdep
1.09
1.05,1.14
<0.001
1.05
1.01,1.10
0.014
1.05
1.00,1.10
0.032
Greenspace
1.06
1.02,1.11
0.002
1.07
1.02,1.11
0.002
1.09
1.04,1.15
<0.001
Foodshop
0.96
0.92,1.00
0.080
0.98
0.94,1.02
0.305
0.99
0.93,1.05
0.746
Gym/pool
1.02
0.98,1.06
0.391
1.01
0.97,1.05
0.776
1.00
0.94,1.06
0.960
Active travel
0.97
0.94,1.01
0.176
0.99
0.95,1.02
0.458
0.97
0.92,1.02
0.212
Urban/rural
1.13
1.06,1.20
<0.001
1.09
1.03,1.17
0.004
1.18
1.06,1.32
0.003
NZdep
0.87
0.83,0.90
<0.001
0.94
0.90,0.99
0.011
0.96
0.91,1.01
0.093
Greenspace
1.03
0.99,1.06
0.193
1.01
0.97,1.06
0.540
0.99
0.95,1.04
0.807
Fruit/Veg 5/day
Foodshop
1.10
1.05,1.14
<0.001
1.04
1.00,1.09
0.056
1.03
0.97,1.10
0.331
Gym/pool
1.05
1.01,1.09
0.015
1.01
0.97,1.06
0.575
1.00
0.93,1.06
0.888
Active travel
0.98
0.94,1.01
0.211
1.00
0.96,1.04
0.892
1.03
0.98,1.09
0.236
Note: Categories: Urban/rural: 1 = Main urban area; 2 = Secondary urban area; 3 = Minor urban area; and 4 = Rural area. Environmental variables: quintiles
(1 = best access, 5 = worst access); Deprivation (NZdep) (1 = least deprived, 5 = most deprived).
All bolded values are statistically significant at the 0.05 level.
work (OR = 0.94, p = 0.012) (Table 5). Fully-adjusted results for low overall physical activity indicated no
environmental variables were significant (Model 3).
Results for walking behaviours diverge from those for
overall physical activity. First, decreased access to
greenspace was associated with lower odds of walking
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at least 150 minutes/week (OR = 0.93, p <0.001), while
decreased access to greenspace was associated with
increased odds of walking less than 30 minutes per
week (OR = 1.09, p < 0.001). There was also a significant
trend for low levels of walking to be positively associated
with neighbourhood deprivation. Results for adequate
fruit and vegetable consumption show a significant urban/
rural gradient, with more people meeting recommended
levels in the more rural compared to more urban areas.
Adequate fruit and vegetable consumption was also significantly lower for those living in the most deprived
neighbourhoods, but the test of trend was not statistically
significant in the fully adjusted model.
Table 6 includes the results of regression analyses,
where the ORs represent comparisons with the reference
categories, for weight-related behaviours. Urban/rural status was significantly associated with meeting the recommended level of physical activity per week for the most
rural category compared to the most urban category
(OR = 1.47, p-value = 0.027). Living in neighbourhoods
with low levels of active transport to work was, again
surprisingly, associated with increased odds of being
highly physically active. We found decreased odds of
low levels of physical activity in areas of lower access to
gym/pool compared to areas with high access, but the
test of overall trend was not significant (p = 0.350). We
found increased odds of walking 150 minutes or more
per week for secondary urban areas compared to main
urban areas (OR = 1.28, p = 0.016). We also found significant decreased odds of walking in the lowest categories
of access to greenspace compared with the best level of
access (ORs 0.73 and 0.76), with an overall significant
trend (p <0.001). We also found significant associations
between higher levels of deprivation and low levels of
walking compared to the lowest deprivation category,
with an overall significant trend (p = 0.032). Decreased
access to greenspace was associated with increased
odds of walking less than 30 minutes of walking per
week, with an overall significant trend (p < 0.001). Last,
we found that rural/urban status was associated with
adequate consumption of fruits and vegetables, where
more rural areas had increased odds of adequate consumption, compared to more urban areas, with an overall
significant trend (p = 0.003).
Discussion
We found that unhealthy weight categories and low levels
of walking were all statistically significantly associated
with area-level deprivation, independent of individuallevel deprivation status, suggesting that overweight and
obesity and walking are affected by neighbourhood context. Our findings are consistent with other New Zealand
statistics indicating increased prevalence of obesity in
more deprived neighbourhoods and [3] research which
Page 8 of 13
found that area-level deprivation was associated with
obesity in adolescents [38]. These findings are consistent
with conclusions from a number of countries including
the UK [39], Australia [40] and the USA [41], which indicate the obesity and obesity-related behaviours was
associated with neighbourhood deprivation, independent
of individual income. Other New Zealand research has
shown that other factors are correlated with neighbourhood deprivation which may affect walking behaviours,
including both recorded and perceived crime [42]. The
fear of neighbourhood crime has also exhibited a negative
impact on mental and physical wellbeing in New Zealand
[43], and has been shown to reduce residents’ walking
within the local neighbourhood in Australia [44] and
the UK [45]. Future research may further untangle the
causal mechanisms in our identified association between
overweight and obesity and walking behaviours and neighbourhood deprivation status by including neighbourhood
crime measures.
Our results indicate that the local availability of greenspace promotes both healthy weight status and patterns
of behaviour that facilitate the maintenance of healthy
weight, particularly walking. Our findings are consistent
with similar studies in England, which found proximity
to greenspace to be protective against overweight and
obesity and to promote physical activity [46]. However,
in other New Zealand research using the same survey
as our study and adjusting for similar individual-level
confounders, Richardson et al found that proportion of
greenspace within the neighbourhood was not related
to overweight status [47]. However, in that study, several differences in variable measurement may have led
to the differences in the observed relationships. First,
our greenspace measures were proportions of useable
greenspace as quintiles per meshblock unit, while Richardson et al calculated proportions of all greenspace
per census area unit as quartiles. Second, Richardson et
al restricted the sample to urban residents only. Last,
we included individual-level confounders, area-level
deprivation and all other environmental characteristics
in our fully adjusted model. Yet, Richardson et al omitted area-level deprivation, urban/rural status, access to
foodshop, access to gym and neighbourhood active
travel. The inconsistent findings between these two
studies highlight the importance of environmental variable measurement and inclusion variables. Similarly, we
did not detect a significant association between access
to greenspace and level of overall physical activity, but
did find that increased access to greenspace was associated with higher levels of walking. However, Richardson
et al found that individuals living in the greenest areas
were significantly more likely to conduct at least
150 minutes of physical activity per week than those in
the least green areas.
Category 1
Category 2
OR
95% CI
Category 3
p-value
OR
95% CI
Category 4
p-value
OR
95% CI
Category 5
p-value
OR
95% CI
p-value
1.10
0.89,1.36
0.364
p trend
Active 5+ days
Urban/rural
Reference
1.21
0.97,1.50
0.089
1.08
0.78,1.51
0.634
1.47
1.05,2.06
0.027
NZdep
Reference
0.97
0.81,1.16
0.717
0.92
0.75,1.12
0.380
1.00
0.83,1.20
0.983
0.038
0.113
Greenspace
Reference
1.06
0.89,1.26
0.913
1.15
0.97,1.38
0.082
0.93
0.78,1.11
0.316
0.94
0.75,1.18
0.598
0.579
Foodshop
Reference
1.13
0.95,1.34
0.159
0.96
0.81,1.14
0.612
1.09
0.88,1.34
0.451
1.34
0.98,1.83
0.064
0.599
Gym/pool
Reference
0.97
0.82,1.15
0.714
0.88
0.72,1.06
0.165
1.01
0.79,1.30
0.928
1.13
0.85,1.49
0.398
0.942
Active travel
Reference
0.84
0.70,1.01
0.067
0.81
0.66,1.00
0.047
0.80
0.66,0.97
0.026
0.73
0.59,0.91
0.005
0.012
Reference
1.14
0.81,1.59
0.458
1.16
0.61,2.21
0.641
1.13
0.62,2.06
0.681
Active <30 mins/week
Urban/rural
0.548
NZdep
Reference
1.21
0.91,1.61
0.184
1.28
0.96,1.72
0.098
1.35
1.00,1.82
0.051
1.35
1.00,1.80
0.053
0.051
Greenspace
Reference
1.11
0.86,1.43
0.633
1.17
0.80,1.37
0.875
1.17
0.89,1.54
0.865
1.08
0.75,1.54
0.687
0.473
Foodshop
Reference
1.02
0.79,1.31
0.893
1.06
0.84,1.35
0.610
0.95
0.70,1.29
0.755
0.88
0.49,1.59
0.680
0.887
Gym/pool
Reference
0.92
0.72,1.18
0.501
0.98
0.76,1.25
0.846
0.67
0.46,0.99
0.045
0.85
0.56,1.30
0.460
0.350
Active travel
Reference
1.05
0.77,1.43
0.762
1.07
0.76,1.50
0.705
1.12
0.80,1.55
0.507
1.04
0.73,1.49
0.812
0.726
1.15
0.92,1.43
0.222
0.208
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Table 6 Association between obesity-related behaviours and environmental factors – fully adjusted models only
Walk 150+ mins/week
Urban/rural
Reference
1.28
1.05,1.57
0.016
0.96
0.73,1.26
0.771
1.17
0.83,1.64
0.368
NZdep
Reference
1.07
0.87,1.30
0.529
1.01
0.83,1.24
0.898
1.11
0.91,1.36
0.315
0.284
Greenspace
Reference
1.05
0.88,1.25
0.677
0.94
0.78,1.14
0.600
0.73
0.61,0.88
0.004
0.76
0.62,0.94
0.011
<0.001
Foodshop
Reference
1.07
0.89,1.28
0.673
0.94
0.78,1.12
0.494
1.05
0.85,1.31
0.650
1.36
1.00,1.83
0.048
0.625
Gym/pool
Reference
0.95
0.79,1.14
0.564
0.88
0.72,1.07
0.195
1.06
0.83,1.36
0.635
1.07
0.80,1.43
0.642
0.930
Active travel
Reference
1.06
0.86,1.30
0.593
0.85
0.67,1.07
0.162
0.92
0.74,1.16
0.490
0.95
0.74,1.22
0.694
0.475
Reference
0.96
0.78,1.18
0.697
0.84
0.62,1.14
0.260
0.74
0.51,1.06
0.096
Walk <30 mins/week
Urban/rural
0.099
NZdep
Reference
1.13
0.93,1.36
0.222
1.39
1.14,1.70
0.001
1.26
1.03,1.54
0.022
1.22
0.99,1.49
0.062
0.032
Greenspace
Reference
1.09
0.92,1.29
0.981
1.24
1.03,1.49
0.026
1.37
1.14,1.64
0.001
1.36
1.09,1.70
0.006
<0.001
Foodshop
Reference
0.90
0.76,1.07
0.230
0.91
0.77,1.09
0.311
0.94
0.76,1.17
0.583
1.05
0.77,1.43
0.768
0.746
Gym/pool
Reference
0.93
0.78,1.10
0.378
1.03
0.85,1.24
0.785
0.96
0.75,1.22
0.717
0.93
0.71,1.23
0.631
0.960
Active travel
Reference
1.00
0.82,1.23
0.976
1.11
0.89,1.38
0.368
1.03
0.82,1.28
0.818
0.86
0.67,1.09
0.213
0.212
Urban/rural
Reference
1.09
0.89,1.33
0.396
1.45
1.05,2.02
0.025
1.68
1.19,2.36
0.003
NZdep
Reference
1.04
0.86,1.25
0.705
0.86
0.72,1.05
0.134
1.00
0.82,1.24
0.930
0.80
0.65,0.99
0.044
0.093
0.003
Greenspace
Reference
1.06
0.88,1.27
0.413
1.04
0.86,1.25
0.429
1.03
0.86,1.23
0.336
0.94
0.75,1.19
0.636
0.807
Page 9 of 13
Fruit/Veg 5/day
Foodshop
Reference
1.12
0.93,1.35
0.222
1.10
0.91,1.33
0.339
1.19
0.95,1.49
0.125
0.98
0.70,1.39
0.922
0.331
Gym/pool
Reference
1.03
0.86,1.22
0.771
1.04
0.86,1.26
0.682
1.06
0.82,1.36
0.665
0.90
0.69,1.19
0.472
0.888
Active travel
Reference
0.99
0.82,1.20
0.950
1.13
0.92,1.40
0.242
1.18
0.96,1.46
0.123
1.08
0.86,1.36
0.497
0.236
Note: Categories: Urban/rural: 1 = Main urban area; 2 = Secondary urban area; 3= Minor urban area; and 4 = Rural area.
Environmental variables: quintiles (1 = best access, 5 = worst access); Deprivation (NZdep) (1= least deprived, 5= most deprived).
All bolded values are statistically significant at the 0.05 level.
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Table 6 Association between obesity-related behaviours and environmental factors – fully adjusted models only (Continued)
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We also found that meeting the recommended level of
physical activity per week was associated with urban/
rural status, with higher activity in the more rural areas.
This may relate to the trend for people to engage in
physically active employment in rural areas, compared to
urban areas. For example, one study found that individuals
in China, Fiji and Malaysia living in urban areas were
more physically active during leisure time but less active
at work and in commuting compared to those in rural
areas [48]. However, research from the US indicated that
urban/rural status was not associated with pedometermeasured physical activity among adults [49].
Surprisingly, we also found a negative association between physical activity levels and percentage of neighbourhood residents engaging in active travel to work. The
reasons for these findings are speculative at this stage.
However, possible reasons include the tendency for areas
of high active travel to be urban environments [50] with
higher levels of traffic, pollution, and decreased safety. As
such, engagement in physical activity (for leisure) may be
less attractive. Comparison cannot be made with other
international studies, as research in this area is scant most
likely due to the lack of national data on neighbourhood
commuting patterns which is available in New Zealand.
Results for adequate fruit and vegetable consumption
show a significant urban/rural gradient, with more people
meeting recommended levels in more rural compared to
more urban areas. Possible reasons for this finding include
the higher availability of home grown produce or availability of farm stands selling local produce. A recent review
identified two USA studies which also found that residing
in a rural area was associated with higher fruit and
vegetable intakes [51]. A number of studies use distance
to nearest supermarket, which could be considered a
proxy for rural/urban status, to test the relationship with
individual-level consumption of fruit and vegetable. In
New Zealand, such a study found that geographic access
to supermarkets was not associated with individuals’ vegetable intake [22]. Since our analyses adjusted for distance
to nearest food shop, we identified an independent effect
of urban/rural status on fruit/vegetable consumption.
This study is not without its limitations. The health and
behaviour data used in this study were cross-sectional,
limiting the ability to draw conclusions about causality. In
addition, we did not account for the potential lag between
exposure and outcome or the length of residence in a
neighbourhood. Future longitudinal research could improve upon both of these limitations. In addition, all
weight-related behaviours were self-reported. The use of
objective measures of fruit/vegetable intake and physical
activity would serve as future research improvements.
Also, we were limited by the number of environmental
variables permitted by the Ministry of Health. As a result,
some relevant neighbourhood characteristics (e.g. crime
Page 11 of 13
rates) were not included and others were aggregated (e.g.
foodshops included both grocery and fast food as one
variable) in these analyses. The aggregation of types of
food outlets limited our ability to separately assess the potential positive influence of access to stores offering
healthy food options from the potential negative influence
of access to unhealthy food options and therefore may
be the reason for our largely null findings for this
neighbourhood variable. Individuals may make use of
several neighbourhood environments in addition to a
residential neighbourhood. For example, individuals may
exercise at a park near work or meet a friend in their
neighbourhood for a walk. As such, expansion of environmental exposures to incorporate non-residential environments and percentage of time spent in each area would
progress our understanding of the environmental determinants of this global epidemic, obesity.
Conclusion
These results highlight greenspace as an amenable environmental factor associated with obesity/overweight. Park
creation and planting in existing public spaces may serve
as low-cost disease prevention options. Our results also
indicate the potential benefit of targeted health promotion in both urban and deprived areas in New Zealand.
Endnotes
a
http://www.moh.govt.nz/moh.nsf/indexmh/portraitof-health.
Competing interests
We have no competing interests to declare.
Authors’ contributions
All authors conceived of the study. PD performed data compilation and
preliminary analyses. GB performed data analysis. AP drafted the manuscript.
All authors provided edits to the manuscript. All authors read and approved
the final manuscript.
Acknowledgements
Access to the data used in this study was provided by Statistics New
Zealand under conditions designed to give effect to the security and
confidentiality provisions of the Statistics Act of 1975. The results presented
in this study are the work of the authors, not Statistics New Zealand.
Author details
1
Department of Public Health, University of Otago - Wellington, 23A Mein
Street, Wellington 6242, New Zealand. 2School of Environmental Sciences,
University of East Anglia, Norwich NR4 7TJ, UK. 3Department of Geography,
University of Canterbury, GeoHealth Laboratory, Private Box 1400,
Christchurch 8140, New Zealand.
Received: 28 January 2014 Accepted: 29 May 2014
Published: 4 June 2014
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doi:10.1186/1471-2458-14-553
Cite this article as: Pearson et al.: Associations between neighbourhood
environmental characteristics and obesity and related behaviours
among adult New Zealanders. BMC Public Health 2014 14:553.
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