ABSTRACT
ObjectiveTo investigate the prevalence of 15 skin diseases in adolescents from Liangshan prefecture in Sichuan Province.Methods A stratified cluster random sampling method was used to select subjects.Adolescents from 2 urban and 3 rural middle schools were investigated,who were required to fulfill self-report questionnaires and received physical examinations by doctors.ResultsA total of 7747 adolescents aged from 12 to 20(15.86 ± 1.86) years were included in the investigation,and skin diseases were present in 6379 adolescents,with a total incidence of 82.34％.In average,each subject suffered from 1.3372 ± 0.96861 skin diseases.Of the adolescents,4698(60.64％) had acne,2219(28.64％) freckle,966(12.47％) lichen pilaris,792(10.22％) eczema or dermatitis,511(6.60％) urticaria,195(2.52％) papular urticaria,37 (0.48％) vitiligo,55 (0.71％) psoriasis,166 (2.14％) verruca vulgaris,168 (2.17％) flat wart,317 (4.09％) tinea manus and pedis,142 (1.83％) tinea corporis,62 (0.80％) chloasma,26 (0.34％) nevus flammeus,15 (0.19％) nevus of ota.Male adolescents showed a higher incidence of acne(63.91％ vs.58.50％),but a lower incidence of eczema,lichen pilaris,freckle,chloasma and psoriasis compared with female adolescents.The incidence of acne,vitiligo,psoriasis and melasma were higher,while that of freckele was lower(25.93％ vs.29.58％ ) in Yi adolescents than in Han adolescents.Increased incidence of acne and papular urticaria and decreased prevalence of urticaria,freckle,melasma and lichen pilaris were observed in urban adolescents compared with rural adolescents.ConclusionsThe prevalence of skin diseases is high in adolescents from Liangshan prefecture.Of these 15 skin diseases,acne,freckle,lichen pilaris,eczema and urticaria are the 5 most common diseases in the area.Differences exist in the incidence of skin diseases between male and female,Han and Yi,urban and rural,adolescents.
ABSTRACT
Objective To investigate the prevalence of vitiligo in China through a multi-center and larse-population epidemiological survey.Methods A community-based survey was conducted in 6 cities from 6 provinces.Cluster sampling method was used.Subjects were required to fulfill the self-report questionnaires and received physical examination by dermatologists.EpiData and SPSS11.5 were utilized for statistical analysis. Results Totally,19 974 patients participated in this study,and 17 345 valid questionnaires were retrieved with a return rate of 86.84%.Of them,122 were found to have vitiligo.The prevalence and standardized prevalence of vitiligo was 0.70% and 0.56% in all patients,0.95% (75) and 0.69% in male patients and 0.50% (47) and O.45% in female patients.respectively.A significant elevation was observed in the prevalence of vitiligo in males than in females (P<0.01).The prevalence of vitiligo was increased with age and peaked in patients aging from 60 to 69 years and those over 70 years.The age at onset of vitiligo varied from 0 to 19 years in 21.85% of these patients,from 20 to 49 years in 47.05%.The most connnon type was focal vitiligo,which accounted for 36.06%,while the rarest type wag segmental type (2.46%).The pesitivity rate of family history of vitiligo was 9.84% in patients and 1.31% in community population (P<0.01).About 31.97% of the patients complained of negative influence of vitiligo on quality of life.Conclusions The standardized prevalence of vitiligo is 0.56%in 6 provinces from China.Males seem to have a higher prevalence of vifiligo than females.