Soc Psychiatry Psychiatr Epidemiol (2009) 44:1–7
DOI 10.1007/s00127-008-0400-7
ORIGINAL PAPER
Malin Gren-Landell Æ Maria Tillfors Æ Tomas Furmark Æ Gunilla Bohlin Æ Gerhard Andersson
Carl Göran Svedin
Social phobia in Swedish adolescents
Prevalence and gender differences
Received: 22 January 2008 / Accepted: 10 June 2008 / Published online: 29 July 2008
j Abstract Background The aim of this study was to
investigate the prevalence of self-reported social phobia in a community sample of Swedish adolescents in
junior high school, at the risk-period for developing
social phobia. Of particular interest was to investigate
gender differences in prevalence across ages. Prevalence of sub-threshold social phobia was also studied.
Methods Students in grades 6–8 (aged 12–14) from
seventeen schools in five Swedish municipalities were
screened by means of a self-report questionnaire, the
social phobia screening questionnaire-for children
(SPSQ-C). Results Data from a sample of 2,128 students were analysed and showed a point-prevalence
rate of 4.4% (95%CI 3.5–5.2) and a significant gender
M. Gren-Landell, MSc (&) Æ C.G. Svedin
Dept. of Clinical and Experimental Medicine
Division of Child and Adolescent Psychiatry
Linköping University
581 85 Linköping, Sweden
Tel.: +46-13/224-202
Fax: +46-13/224-234
E-Mail: malgr@imk.liu.se
M. Tillfors
Dept. of Behavioural, Social and Legal Sciences
Örebro University
Örebro, Sweden
T. Furmark Æ G. Bohlin
Dept. of Psychology
Uppsala University
Uppsala, Sweden
G. Andersson
Dept. of Behavioural Sciences and Learning
The Swedish Institute for Disability Research
Linköping University
Linköping, Sweden
j Key words prevalence – social phobia – adolescents – gender
Introduction
Social phobia, or social anxiety disorder, is described
in the DSM-IV [3] as a marked and persistent fear of
one or more social and performance situations in
which embarrassment may occur. Exposure to unfamiliar people or possible scrutiny of others typically
evokes anxiety and tends to be avoided or endured
under great distress. Social phobia is argued to exist
on a continuum, varying in severity and number of
feared situations [19]. Lifetime prevalence rates of
social phobia range from 3.9–13.7% in Western
societies [17, 19, 23, 24, 32]. The notable variation in
prevalence can largely be explained by methodological factors in addition to true cultural differences [19].
Lifetime prevalence rates of DSM-III-R and DSMIV defined social phobia in community samples
of children and adolescents also vary considerably,
SPPE 400
G. Andersson
Dept. of Clinical Neuroscience
Karolinska Institutet
Stockholm, Sweden
difference (6.6% girls vs. 1.8% boys, P < 0.001). No
significant differences in prevalence of probable cases
emerged across the ages. At sub-threshold level,
marked social fear of at least one social situation was
reported by 13.8% of the total group. ‘‘Speaking in front
of class’’ and ‘‘calling someone unfamiliar on the
phone’’ were the most feared social situations. In
the social phobia group, 91.4% reported impairment
in the school-domain due to their social fear. Conclusion Social phobia is a common psychiatric condition
in Swedish adolescents, especially in girls. As impairment in the school-domain is reported to a high degree,
professionals and teachers need to recognize social
phobia in adolescents so that help in overcoming the
difficulties can be offered.
2
ranging from 0.9 to 13.1% [26]. The highest rates have
been noted in studies of older adolescents and young
adults [14, 24, 27, 36, 41, 44].
Onset of social phobia is reported to be in early- to
mid-adolescence with a median age ranging from 12
to 16.6 years [8, 11, 17, 34], thus starting earlier in life
compared to most other mental disorders [23]. Earlier
onset is associated with a higher number of social
fears [32] and with fear of more than one social- or
performance situation, typical for the generalized
subtype of social phobia [44].
Time of onset and the higher prevalence seen in
adolescents compared to children can be associated
with various aspects of cognitive maturation, e.g. an
increased ability to take others viewpoints. While this
ability is useful, it can also mean that the adolescent
becomes more aware of others’ attention and the social
evaluation and the opinions of peers might cause
distress in some individuals [6]. Other explanations
for the higher rates in adolescents compared to children could be increasing academic and social demands and encounters with a wider range of social
situations [30]. During the teenage years it becomes
more important to be part of a group and the risk of
being excluded from the social group can be perceived
as particularly distressing during this period [6].
In adult populations, a majority of studies report a
female preponderance of social phobia as well as subthreshold social phobia [9–11, 24, 34]. The gender
ratio seems to vary somewhat across different levels of
social anxiety [13]. Although not as extensively
studied, older adolescents show similar patterns as
adults [14, 31, 41, 44].
Social phobia is associated with serious negative
consequences, such as impaired quality of life and
socio-economic disadvantages [17, 36]. Considerable
impairment and distress have also been noted in subthreshold social phobia, i.e. individuals reporting
excessive social anxiety without meeting the full
diagnostic criteria for social phobia [13, 16]. It can
therefore be argued that sub-clinical levels of the
disorder deserve more attention from researchers and
clinicians. Moreover, as there is no exact diagnostic
threshold for social phobia, epidemiological research
may benefit from studying prevalence rates across
different levels of impairment and distress [19].
Most of the published prevalence studies on social
phobia have been conducted on adult samples in
Western but non-European countries [17]. There is to
date no published study on the prevalence of social
phobia in Swedish adolescents. The only Scandinavian study so far is a report on social phobia among
Finnish children in the ages of 8- to 9 years with an
estimated prevalence of 0.1% [1]. Reports on mental
health in the Swedish general population and in other
countries during the last decades, show an increase of
internalizing symptoms such as anxiety and depression, in all age-groups and for both genders [33].
These symptoms are however more common among
adolescent girls [33]. Increasing female excess in
general psychological distress is reported from the age
of eleven to fifteen [38].
Given the reports of increasing mental health
problems, especially in girls and the shortage of
studies, there is a need for European studies on the
prevalence of social phobia and gender differences in
samples under the age of sixteen [43]. Thus, the aim of
the present study was to examine the prevalence of
social phobia, and sub-threshold social phobia, among
Swedish adolescents in early- to mid-adolescence, at
the typical period for onset for this disorder. In light of
the female preponderance in adult community samples, we expected girls to report social phobia to a
higher degree than boys. We also expected an increase
in prevalence rates to appear over the ages as higher
rates are seen in studies of older adolescents.
Method
j Subjects
Students from 17 comprehensive schools in five Swedish municipalities participated. The total sample consisted of 3,037 students in
grades 6–8. In the Swedish school-system students enter school at
the age of 6 years. Thus, students in grade 6 are normally at the
ages of 11–12 years, grade 7 in the ages of 12–13 and students in
grade 8 are normally in the ages of 13–14. A total of 1,104 boys,
(47.1%) and 1,241 girls (52.9%) agreed to participate, resulting in
an acceptable response rate of 77%. Reasons for not responding
could be absence from school or disagreement to participate. Data
from the non-responders were not collected. The response rate
according to grade was 82% out of 1,005 students in grade six, 77%
out of 888 students in grade seven and 79% out of 1,144 students in
grade eight. The response rate ranged from 73–87% in the five
municipalities.
Due to incompletely filled out questionnaires, final data for
analysis consisted of 2,128 respondents (992 boys, 46.6% and 1,136
girls, 53.4%) aged 11–15 years with a mean age of 13.1 years. None of
the responders with incomplete questionnaires reported much distress in the phobic situations covered and thus they would not have
been diagnosed with social phobia if included.
j Procedure
The schools were recruited from five municipalities which were
representative of the Swedish population by socio-economic composition such as gender distribution, proportion of inhabitants of
foreign origin, proportion of inhabitants under the age of 17 and
proportion of marriages [35]. Three municipalities were mediumsized (20–50.000 inhabitants, i.e. Nässjö, Värnamo and Västervik),
and two were large-sized (50–200.000 inhabitants, i.e. Jönköping and
Linköping) according to Swedish demographics [35]. Twelve of the
seventeen schools were situated in medium-sized municipalities and
five schools in large-sized. The schools were recruited to obtain a
representative sample of schools with small, medium and large
number of students and with small, medium and large number of
students from families of foreign origin.
Data collection took place in 2005. The study was approved by
the Central Ethics Committee concerning Human Research in
Sweden.
Parents and students were given written information administered by the school-staff. Participation was voluntary and parents
could contact the principal investigator in case they did not want
their child to participate (n = 31). Students were also informed
3
about the voluntary investigation directly in the classroom either
by a person from the project or by the teacher who had been given
written information to read for the students. The questionnaire was
administered to the students in their classroom.
j Questionnaire
A DSM-IV [3] diagnosis of social phobia (probable case) was
established by means of the Social Phobia Screening Questionnaire
for Children (SPSQ-C), which is a modified version of the social
phobia screening questionnaire (SPSQ) [20]. The SPSQ has been
used in adult studies [7, 20, 39]. Psychometric evaluation of the
SPSQ-C has shown a test–retest of r = 0.60 over 3 weeks, and a
sensitivity of 71% and specificity of 86% (unpublished data) in
relation to SCID-I [18]. In the present study, the eight phobic situations in the SPSQ-C had an alpha coefficient of 0.78 reflecting an
acceptable internal consistency.
The diagnostic section of the SPSQ-C was based on 8 potentially
phobic situations. These situations were: ‘‘speaking in front of the
class’’, ‘‘raising your hand during a lesson’’, ‘‘being together with
others during breaks’’, ‘‘initiating a conversation with someone
unfamiliar’’, ‘‘looking someone in the eyes during a conversation’’,
‘‘making a phone-call to someone unfamiliar’’, ‘‘going to a party’’,
and lastly ‘‘eating together with others during the lunch-break’’.
The respondent rated their perceived social fear in these potentially
phobic situations on a three-point scale ranging from no fear, or
some fear to marked fear. Five diagnostic questions followed,
assessing whether the individual met the DSM-IV social phobia
criteria A, B and D for one or more of the phobic situations. Since
the youths were below 18 years old the C-criteria, realizing that the
fear is excessive or unreasonable, did not have to be fulfilled. The Ecriterion was assessed with three yes/no questions, i.e. the student
was asked whether the social fear was of such nature that it severely
interfered with or severely interfered with his/her activities in
school, during leisure-time or when being with peers. The eighth
and last question covered the F-criterion of 6-month duration (yes/
no question).
j Diagnostic issues
For a probable diagnosis of social phobia, the student had to rate at
least one potentially phobic situation as marked fear on the social
fear scale. This particular situation had to be consistently endorsed
in the diagnostic questions covering social phobia criteria A, B and
D. The E-criterion had to be met, i.e the report of impairment in at
least one of the three life domains assessed. Lastly, the F-criterion,
Table 1 Point-prevalence rates (%)
of DSM-IV social phobia (probable
cases) by gender among Swedish
adolescents and summary results of
logistic regression presented with
odds ratios (OR) and P-values
Grade (age)
6 (11–12)a
7 (12–13)a
8 (13–14)a
Total
Grand total
a
Gender (n)
Boys (226)
Girls (290)
Total (516)
Boys (401)
Girls (407)
Total (808)
Boys (365)
Girls (439)
Total (804)
Boys (992)
Girls (1,136)
2,128
concerning persistence of symptoms for more than 6 months, also
had to be fulfilled. Four cut-off levels were chosen for measuring
sub-clinical levels of social phobia. The first level concerned
marked fear in at least one social situation on the first item of
SPSQ-C. The second level concerned marked fear in at least one
social situation and impairment in one life-domain. On the third
level all criteria for social phobia except the 6-month duration
(criteria A–E) were to be fulfilled and on the highest level, all criteria (A–F) for social phobia according to DSM-IV (criteria A–F)
had to be fulfilled.
j Statistical analyses
Prevalence rates are displayed as point prevalence with 95% confidence intervals (CI). For categorical variables, group differences
were evaluated by use of v2 tests. Logistic regression was used in
order to assess the increased odds of presenting with social phobia
in relation to gender. Grade was used as a covariate when calculating odds ratios for gender. All analyses were performed in SPSS
version 14.0 (SPSS, Inc., Chicago, IL, USA). Grade was used as
variable instead of age due to small numbers in the youngest agegroup (aged 11) and the oldest (aged 15). This was also motivated
by the notion that students from the same grade might be more
similar with regard to psychological maturation and environmental
demands as compared to students of the same age but in different
grades.
Results
j Prevalence of social phobia
The proportions of respondents fulfilling the DSM-IV
criteria of social phobia (probable cases) are presented in Table 1 for gender and for grade separately.
In the total group, a point-prevalence of 4.4%
(95%CI = 3.5–5.2) was found.
A significant gender difference was found in the
total group, and for each grade, with higher prevalence
of social phobia in girls than in boys (see Table 1).
There was no significant difference in prevalence
between the grades neither in the total group
(v2 = 1.69, df = 2, NS) nor when analysed separately
Social phobia
n (%)
(95%CI)
OR (95%CI)
P
3
18
21
8
23
31
7
34
41
18
75
93
(0.2–2.8)
(3.4–9.0)
(2.4–5.8)
(0.6–3.4)
(3.4–8.0)
(2.4–5.8)
(0.5–3.3)
(5.2–10.3)
(3.6–6.6)
(1.0–2.6)
(5.2–8.0)
(3.5–5.2)
4.20 (1.43–16.91)b
<0.01
2.94 (1.30–6.66)b
<0.01
4.30 (1.88–9.81)b
<0.001
3.83 (2.27–6.50)c
<0.001
(1.3)
(6.2)
(4.1)
(2.0)
(5.7)
(3.8)
(1.9)
(7.7)
(5.1)
(1.8)
(6.6)
(4.4)
Age ranges are presented for the regular age ranges in each grade. In grade 6 eight children (1.6%) were 13 years old, in
grade 7 thirteen students (1.6%) were 14 years old and in grade 8 two students (0.2%) were 12 years old and eleven
students (1.4%) were fifteen years old
b
Within grade
c
Adjusted for grade
4
for girls (v2 = 1.60, df = 2, NS) and for boys
(v2 = 0.40, df = 2, NS). As is seen in Table 1, a more
than three-fold increase in risk for girls to present with
social phobia was found in the total group (OR = 3.83,
95%CI = 2.27–6.50, P < 0.001).
Data were further analysed according to urban
status and the estimated prevalence was 4.0% for
medium-sized municipalities as compared to 4.6%
for large-sized municipalities (v2 = 0.32, df=1, NS).
Because this was not statistically significant, urban
status was not further considered.
j Sub-threshold social phobia
Prevalence estimates of sub-threshold social phobia,
across gender and age, were based on four cut-off
levels (see Table 2). Prevalence rates decreased from
13.8% at the most liberal level to 4.4% at the most
stringent level (all criteria for social phobia fulfilled).
Significantly higher rates for girls were noted on all
levels (Table 2).
j Feared situations
Table 3 shows the proportion of students reporting
marked fear in each of the eight situations in the
SPSQ-C. ‘‘Speaking in front of class’’ was the most
common fear followed by ‘‘making a phone-call to
someone unfamiliar’’. Grade did not have a significant
impact on the prevalence of marked social fears
(v2 = 1.40, df = 2, NS).
j Impairment
In the total group, impairment of school activities was
more commonly reported (17.2%) than of activities
during leisure time (4.1%) and when being with peers
(3.1%). Significantly more girls than boys in the total
group reported impairment in school (v2 = 21.42, df
= 1, P < 0.01).
School impairment was reported by 91.4% of the
social phobia group. Significantly more students in
grade seven (aged 12–13) and grade eight (aged 13–
14) reported impairment of school activities compared with students in grade six (aged 11–12)
(v2 = 8.45, df = 2, P < 0.05).
Discussion
In the present study a point-prevalence rate of 4.4%
was found for self-reported DSM-IV social phobia in a
community sample of Swedish adolescents in junior
high school. The rate is in concordance with those
found in European community samples, showing
prevalence rates of DSM-II-R and DSM-IV social
Table 2 Prevalence rates (%) of probable cases of social phobia and sub-threshold social phobia, with 95%CI, among Swedish adolescents according to four cut-off
levels
Cut-off levela
1
2
3
4
Prevalence
ORb, 95%CI
Total group (n = 2,128)
Girls (n = 1,136)
Boys (n = 992)
n (%)
95%CI
n (%)
95%CI
n (%)
95%CI
293 (13.8)
151 (7.1)
134 (6.3)
93 (4.4)
(12.3–15.2)
(6.0–8.2)
(5.3–7.3)
(3.5–5.2)
181 (15.9)
105 (9.2)
100 (8.8)
75 (6.6)
(13.8–18.1)
(7.6–10.9)
(7.1–10.5)
(5.2–8.0)
112 (11.3)
46 (4.6)
34 (3.4)
18 (1.8)
(9.3–13.3)
(3.3–5.9)
(2.3–4.6)
(1.0–2.6)
1.49
2.10
2.72
3.83
P-value
(1.16–1.92)
(1.46–3.00)
(1.82–4.05)
(2.27–6.45)
<0.01
<0.001
<0.001
<0.001
Summary results of logistic regression presented with odds ratios (OR) and P-values
Definition of cut-off levels: 1 = Marked fear in at least one social situation, 2 = Marked fear in at least one social situation+ impairment in 1 life-domain, 3 = All
criteria for self-reported social phobia except 6-month duration, 4 = All criteria for self-reported social phobia according to DSM-IV
b
Boys = reference group
a
Table 3 Frequency of social fears, i.e. the proportion of respondents reporting ‘‘marked fear’’ for each of the eight social situations on the first item of the SPSQ-C
Situation
1.
2.
3.
4.
5.
6.
7.
8.
Speaking in front of the class
Making a phone-call to someone unfamiliar
Initiating a conversation with someone unfamiliar
Looking someone in the eyes during a conversation
Raising your hand during a lesson
Eating together with others during lunch-break
Going to a party
Being together with others during the breaks
Prevalence n (%)
SP (n = 93)
No SP (n = 2,035)
Total group (n = 2,128)
59 (63.4)
30 (32.3)
27 (29.0)
16 (17.2)
14 (15.1)
8 (8.6)
7 (7.5)
3 (3.2)
73
72
41
45
34
38
27
46
132 (6.2)
102 (4.8)
68 (3.2)
61 (2.9)
48 (2.3)
46 (2.2)
34 (1.6)
49 (2.3)
(3.6)
(3.5)
(2.0)
(2.2)
(1.7)
(1.9)
(1.3)
(2.3)
5
phobia of 0.9–13.1% in children and adolescents [26].
The finding implies that social phobia is a common
condition among Swedish adolescents.
Our initial hypothesis of higher prevalence in girls
than in boys was confirmed as more than a three-fold
increase in risk for girls to present with self-reported
social phobia was found. Higher prevalence of phobias and fears in general is reported in girls [25] and
an increased risk for females compared to males to
develop anxiety disorders and mood disorders [23,
28]. Especially, increasing female excess in self-reported general psychological distress is reported from
the age of eleven to fifteen [38]. Despite reports of
higher incidence of anxiety and depression in females
than in males [33] and that the increasing female
excess of internalizing symptoms is seen during early
to mid-adolescence, the causes underlying this phenomenon remain incompletely understood. Biological
processes such as greater fluxes in reproductive hormones in females, evident during puberty, might
underlie increased proneness to anxiety and depression [2]. Hormonal changes during puberty is reported to partially explain higher rates of depression
in adolescent girls than in boys [4]. The interaction of
puberty and gender to predict symptoms of social
anxiety has been studied by Deardorff and colleagues
[12]. They found advanced pubertal development to
be associated with heightened symptoms of social
anxiety in girls but not in boys. The aetiology of social
phobia is thought to be multi-factorial [30] and presumably a variety of biological, psychological and
cultural factors interact. Early physical development
can lead to unwanted sexual attention and body dissatisfaction where girls are thought to be more prone
to negative self-evaluation and others’ opinions
regarding appearance and behaviour [12, 28]. Taken
together, a few hypotheses have been tested in
explaining gender differences in social phobia and
other internalizing disorders. It would be of interest
to find a model within a developmental psychopathology framework for understanding possible gender-specific pathways in developing social phobia as
well as in other common internalizing disorders [21].
Contrary to what was expected, significant age
differences were not found in the present study. The
prevalence of social phobia and of social anxiety has
been reported to increase in mid-teenage [14, 44] with
a peak in the age of 14–15 years [15, 29]. The highest
prevalence rates of mental disorders is noted in the
age-group of 15–24 years compared to older agegroups [24]. The present sample was drawn from a
population of students in grade 6–8 (aged 12–14).
There were a few students in the age of eleven (2.3%)
and in the age of fifteen (0.5%). The possibility to
detect age differences might have been limited by this
relatively narrow range and by a small proportion of
individuals in the age of 15 years.
Another objective of the present study was to
investigate the prevalence of sub-threshold social
phobia as this disorder is argued to exist on a continuum, varying in severity and symptoms. Prevalence rates increased from 4.4% for cases fulfilling all
criteria for social phobia according to self-report, to
6.3% when removing the criteria of 6-month duration.
A prevalence of 13.8% at the most liberal level, i.e. the
report of marked fear of at least one social situation,
was found. Studies of social fears vary in methodology, like type and number of situations assessed,
and therefore a summary of findings is not easily
captured. Recent results from a replication of the
National Comorbidity Survey showed that 24.1% of
the US adult population reported at least one social
fear [32]. In a community study of German adolescents a high proportion, 47.2% of the total group,
reported fear of any of the social situations investigated
[14]. Thus, the prevalence of social fear was lower in the
present study than in the studies mentioned.
Concerning type of fear, ‘‘speaking in front of the
class’’ was most commonly reported. This finding is
in line with other in other epidemiological studies of
adults as well as children and adolescents, showing
that public speaking is the most common fear [5, 42,
43]. However, Wittchen and colleagues [44] noted
that fear of tests and examinations was the most
prevalent social fear in German adolescents.
The above findings imply that the most commonly
feared situations for children are encountered in
schoolsettings [37]. Social phobia has previously been
associated with academic underachievement, school
refusal or school drop-out [40]. We noted that 17.2%
of all respondents and 91.4% of probable cases of
social phobia reported impairment of school activities
due to social fear. Significantly more girls than boys
were reporting social phobia and also, significantly
more girls than boys reported school-impairment.
Despite the facts that social phobia is highly prevalent
and associated with negative consequences for school
life, the recognition of social anxiety in students has
been reported to be poor in school personnel as well
as in parents [22]. Thus, to detect students with
excessive social anxiety and to limit its negative effects on academic achievement and mental well-being
in general, there is a need for increased awareness and
knowledge about social phobia in school settings,
with extra attention to female students on this issue.
Limitations
Some methodological limitations should be addressed
in the present study. Firstly, in this initial study, the
prevalence of social phobia was established by use of
a screening questionnaire only. Therefore, cases of
social phobia should be regarded as probable cases
rather than as a formal diagnosis of social phobia.
Secondly, in the present study, students were
included only if they attended school at the time for
the investigation and if they agreed to participate.
6
Social phobia is associated with school-absenteeism
and school-refusal and students with disabling levels
of social anxiety might have been absent due to social
fear or chose not to participate due to fear of negative
attention, possibly lowering the prevalence estimate.
Still, there was a relatively high response rate and the
prevalence rate in the present study was similar to
rates found in other studies.
Lastly, no control was made for socio-demographic
factors other than gender, age and urban status and
the generalizability of the results is limited to students
in grade 6–8 (aged 12–14) in Swedish municipalities
of 30.000–135.000 inhabitants. The schools were recruited from municipalities that were representative
for the population regarding major socio-demographic variables but data on the sample, like ethnicity and parental characteristics would have been of
interest.
Conclusions
Social phobia tends to be a common condition among
Swedish adolescents, especially in girls. The results
from this study call for longitudinal studies on the
development and course of social phobia due to
gender. There is a need for theoretical models to explain gender differences found in social anxiety
proneness to achieve better guidance for prevention
as well as clinical interventions. The high proportion
of students reporting impairment in the school domain due to social anxiety, calls for reliable and valid
methods and developmentally sensitive instruments
to screen for these conditions. School-health professionals and teachers need to have knowledge about
social phobia, and efficacious interventions to help
students overcome social anxiety need to be made
available.
j Acknowledgment This study was supported by the Sven Jerring Foundation, the Mayflower Foundation, the Research Council of South-Eastern Sweden
(FORSS), the Swedish Psychiatry Foundation and the Organon Foundation.
References
1. Almquist F, Puura K, Kumpulainen K, Tuompo-Johansson E,
Henttonen I, Huikko E, Linna S, Ikäheimo K, Aronen E, Katainen S, Piha J, Moilanen I, Räsänen E, Tamminen T (1999)
Psychiatric disorders in 8–9-year-old children based on a
diagnostic interview with parents. Eur Child Adolesc Psychiatry
8:17–28
2. Altemus M (2006) Sex differences in depression and anxiety
disorders: potential biological determinants. Horm Behav
50:534–538
3. American Psychiatric Association (1994) Diagnostic and statistical manual of mental disorders, 4th edn. American Psychiatric Association, Washington, DC
4. Angold A, Costello EJ, Erkanli A, Worthman CM (1999)
Pubertal changes in hormone levels and depression in girls.
Psychol Med 29:1043–1053
5. Beidel DC, Turner SM, Morris TL (1999) Psychopathology of
childhood social phobia. J Am Acad Child Adolesc Psychiatry
38:643–650
6. Bokhorst CL, Westenberg PM, Oosterlaan J, Heyne DA (2008)
Changes in social fears across childhood and adolescence: age-related differences in the factor structure of the fear
survey schedule for children-revised. J Anxiety Disord 22:
135–142
7. Carlbring P, Gunnarsdóttir M, Hedensjö L, Andersson G,
Ekselius L, Furmark T (2007) Treatment of social phobia from a
distance: a randomized trial of internet delivered cognitive
behaviour therapy (CBT) and telephone support. Br J Psychiatry 190:123–128
8. Chartier M, Walker J, Stein M (2003) Considering comorbidity
in social phobia. Soc Psychiatry Psychiatr Epidemiol 38:728–
734
9. Davidson JRT, Hughes DC, George LK, Blazer DG (1993) The
epidemiology of social phobia: findings from the duke epidemiological catchment area study. Psychol Med 23:709–718
10. Davidson JRT, Hughes DC, George LK, Blazer DG (1994) The
boundary of social phobia. Exploring the threshold. Arch Gen
Psychiatry 51:975–983
11. DeWit DJ, Chandler-Coutts M, Offord DR, King G, McDougall
J, Specht J, Stewart S (2005) Gender differences in the effects of
family adversity on the risk of onset of DSM-III-R social phobia. J Anxiety Disord 19:479–502
12. Deardorff J, Hayward C, Kimberly A, Wilson KA, Bryson S,
Hammer LD, Agras S (2007) Puberty and gender interact to
predict social anxiety symptoms in early adolescence. J Adolesc
Health 41:102–104
13. Dell’Osso L, Rucci P, Ducci F, Ciapparelli A, Vivarelli L, Carlini
M, Ramacciotti C, Cassano GB (2003) Social anxiety spectrum.
Eur Arch Psychiatry Clin Neurosci 253:286–291
14. Essau CA, Conradt J, Petermann F (1999) Frequency and
comorbidity of social phobia and social fears in adolescents.
Behav Res Ther 37:831–843
15. Essau CA, Conradt J, Petermann F (2000) Frequency, comorbidity and psychosocial impairment of anxiety disorders in
German adolescents. J Anxiety Disord 14:263–279
16. Fehm L, Beesdo K, Jacobi F, Fiedler A (2008) Social anxiety
disorder above and belove the diagnostic threshold: prevalence,
comorbidity and impairment in the general population. Soc
Psychiatry Psychiatr Epidemiol 43:257–265
17. Fehm L, Pelissolo A, Furmark T, Wittchen H-U (2005) Size and
burden of social phobia in Europe. Eur Neuropharmacol
15:453–462
18. First M, Gibbon M, Spitzer R, Williams JBW (1997) Structured
clinical interview for DSM-IV axis I disorders (SCID-I).
American Psychiatric Press, Washington, DC
19. Furmark T (2002) Social phobia: overview of community surveys. Acta Psychiatr Scand 105:84–93
20. Furmark T, Tillfors M, Everz P-O, Marteinsdottir I, Gefvert O,
Fredrikson M (1999) Social phobia in the general population:
prevalence and sociodemographic profile. Soc Psychiatry Psychiatr Epidemiol 34: 416–424
21. Hayward C, Sanborn K (2002) Puberty and the emergence of
gender differences in psychopathology. J Adolesc Health
305:49–58
22. Kashdan TB, Herbert JD (2001) Social anxiety disorder in
childhood and adolescence: current status and future directions. Clin Child Fam Psychol Rev 4:37–61
23. Kessler RC, Berglund P, Demler O, Jin R, Merikangas KR,
Walters EE (2005) Lifetime prevalence and age-of-onset distributions of DSM-IV disorders in the national comorbidity
survey replication. Arch Gen Psychiatry 62:593–602
24. Kessler RC, McGonagle KA, Zhao S, Nelson CB, Hughes M,
Eshleman S, Wittchen H-U, Kendler KS (1994) Life-time and
12-month prevalence of DSM-III-R psychiatric disorders in the
United States. Arch Gen Psychiatry 51:8–19
25. Lewinsohn PM, Gotlib IH, Lewinsohn M, Seely JR, Allen NB
(1998) Gender differences in anxiety disorders and anxiety
symptoms in adolescents. J Abnorm Psychol 107:109–117
7
26. Mancini C, Van Ameringen M, Bennett M, Patterson B, Watson
C (2005) Emerging treatments for child and adolescent social
phobia: a review. J Child Adolesc Psychopharmacol 15:589–607
27. Merikangas KR, Avenevoli S, Acharyya S, Zhang H, Angst J
(2002) The spectrum of social phobia in the Zurich cohort
study of young adults. Biol Psychiatry 51:81–91
28. Nolen-Hoeksema S, Girgus JS (1994) The emergence of gender
differences in depression during adolescence. Psychol Bull
115:424–443
29. Ranta K, Kaltiala-Heino R, Koivisto A-M, Tuomisto M, Pelkonen M, Marttunen M (2007) Age and gender differences in
social anxiety symptoms during adolescence: the social phobia
inventory (SPIN) as a measure. Psych Res 153:261–270
30. Rapee RM, Spence SH (2004) The etiology of social phobia:
empirical evidence and an initial model. Clin Psychol Rev
24:737–767
31. Romano E, Tremblay RE, Vitaro F, Zoccolillo M, Pagani L
(2001) Prevalence of psychiatric diagnoses and the role of
perceived impairment: findings from an adolescent community
sample. J Child Psychol Psychiatry 42:451–461
32. Ruscio AM, Brown TA, Chiu WT, Sareen J, Stein MB, Kessler RC
(2007) Social fears and social phobia in the USA: results from the
national comorbidity survey replication. Psychol Med 38:15–28
33. SOU2006:77 (2006) Ungdomar, stress och psykisk ohälsa:
analyser och förslag till åtgärder. In: Slutbetänkande av
Utredningen om ungdomars psykiska hälsa. Stockholm: Fritzes
34. Schneier FR, Johnson J, Hornig CD, Liebowitz MR, Weissman
MM (1992) Social phobia. Comorbidity and morbidity in an
epidemiologic sample. Ach Gen Psychiatry 49:282–288
35. Statistics Sweden (2005) Retrieved January 15, 2008 from
Statistic Sweden website: http://www.scb.se/BE0101
36. Stein MB, Kean YM (2000) Disability and quality of life in
social phobia: epidemiologic findings. Am J Psychiatry 157:
1606–1613
37. Strauss CC, Last CG (1993) Social and simple phobias in
children. J Anxiety Disord 71:141–152
38. Sweeting H, West P (2002) Sex differences in health at ages 11,
13 and 15. Soc Sci Med 56:31–39
39. Tillfors M, Furmark T (2007) Social phobia in Swedish university students: prevalence, subgroups and avoidant behavior.
Soc Psychiatry Psychiatr Epidemiol 42:79–86
40. Van Ameringen M, Mancini C, Farvolen P (2003) The impact of
anxiety disorders on educational achievement. Anx Disord
17:561–571
41. Verhulst FS, Van der Ende J, Ferdinand RF, Kasius MC (1997)
The prevalence of DSM-III-R diagnoses in a national sample of
Dutch adolescents. Arch Gen Psychiatry 54:329–336
42. Vriends N, Becker ES, Meyer A, Michael T, Margraf J (2007)
Subtypes of social phobia: are they of any use? J Anxiety Disord
21:59–75
43. Wittchen H-U, Fehm L (2003) Epidemiology and natural
course of social fears and social phobia. Acta Psychiatr Scand
108:4–18
44. Wittchen H-U, Stein MB, Kessler RC (1999) Social fears and
social phobia in a community sample of adolescents and young
adults: prevalence, risk factors and co-morbidity. Psychol Med
29:309–323