PREVALENCE OF TRUNCAL ACNE IN HIGH SCHOOL STUDENTS: A COMMUNITY BASED STUDY
2006
Background: Acne is one of the most common skin diseases especially in
adolescence. Different studies have reported unequal rates of facial acne prevalence in
different countries and populations. Only a few cases of acne in the trunk area (back
and chest) have been reported in literature. Although our clinical experience shows
lower prevalence of truncal acne in comparison with facial acne, a community based
study is needed to support this experience.
Methods: A total number of 1001 high school students, selected randomly from 5 out
of 20 education-ministry subdivisions of Tehran, were included. In each area two high
schools (one for boys and one for girls) with almost 100 students per high school were
selected. Demographic data, family history and clinical findings were recorded in the
questionnaires.
Consensus Conference on Acne Classification was used for acne grading.
Results: One thousand one high school students, 503 girls and 498 boys ,were
included. Prevalence of acne was 91.1% for face (95%CI: 83-99%), 93.4% in boys
and 88.6% in girls. It was 53.4% for back (95%CI: 46-62.2%), 58.5% in boys and
36.9% in girls. Whereas for chest the prevalence was 36% (95%CI: 27-45%), 34.9%
in boys and 36.9% in girls.
Mean age of the students with truncal acne was 16.1 years where as 15.9 in others.
This difference was significant (P<0.05).
Positive family history was higher in students with truncal acne (P<0.001).
Conclusion: Truncal acne is less prevalent than facial acne. Acne on the back is
significantly higher in boys than girls (P=0.002). Severe forms of acne in back may be
more prevalent in boys. Positive family history can increase the risk of truncal acne.
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