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Wang T.L.,Peking University | Zhou C.,Peking University | Shen Y.W.,Peking University | Wang X.Y.,Peking University | And 13 more authors.
British Journal of Dermatology | Year: 2010

Background There are racial differences in the prevalence and types of androgenetic alopecia (AGA). The prevalence of AGA has been studied in Caucasians and in some Asian people. In China, although there have been some epidemiological studies carried out in single cities or regions, no multicentre population-based study has been reported. Objectives To study the prevalence and types of AGA in China and to compare the results with those previously reported in Caucasians and in other Asian people. Methods A community-based study was carried out in six cities of China. Subjects were interviewed face-to-face and completed questionnaires. The degree of AGA was classified according to the Norwood and Ludwig classifications. Results In total 17 886 subjects were interviewed and 15 257 completed the questionnaires. In men, the overall prevalence of AGA was 21·3%, with 2·8% in men aged 18-29 years, 13·3% in those aged 30-39 years, 21·4% in those aged 40-49 years, 31·9% in those aged 50-59 years, 36·2% in those aged 60-69 years and 41·4% in those aged 70 years and over. The most common type was frontal and vertex hair loss. A small number of subjects (3·7%) showed 'female pattern' hair loss. In women, the prevalence of AGA was 6·0%, with 1·3% in women aged 18-29 years, 2·3% in those aged 30-39 years, 5·4% in those aged 40-49 years, 7·5% in those aged 50-59 years, 10·3% in those aged 60-69 years and 11·8% in those aged 70 years and over. Ludwig grade I was the most common type. The prevalence of AGA varied between cities. A positive family history was present in 29·7% of men and 19·2% of women with AGA. Conclusions The prevalence of AGA in Chinese men and women was lower than in Caucasians and similar to that in Koreans. © 2010 British Association of Dermatologists. Source


Shen Y.,Peking University | Wang T.,Peking University | Zhou C.,Peking University | Wang X.,Peking University | And 13 more authors.
Acta Dermato-Venereologica | Year: 2012

Acne vulgaris is a common skin condition in adolescents. The prevalence of acne is thought to vary between ethnic groups and countries. A large-scale communitybased study was performed in six cities in China to determine the prevalence and possible risk factors for acne in the Chinese population. A total of 17,345 inhabitants were included in this study. Of these, 1,399 were found to have acne. No acne was found in subjects under 10 years of age, and only 1.6% in the 10-yearold group had acne. Prevalence then increased rapidly with age, up to 46.8% in the 19-year-old group. After that, it declined gradually with age. Acne was rare in people over 50 years of age. In subjects in their late teens and 20s, acne was more prevalent in males, while in those over 30 years of age it was more prevalent in females. In subjects with acne, 68.4% had mild; 26.0% had moderate and 5.6% had severe acne. In adult acne, persistent acne was much more common (83.3%) than late-onset acne (16.7%). Smoking and drinking were found to be associated with adolescent acne, while no association was found between diet and acne. These results suggest that the prevalence of acne in the Chinese population is lower than that in Caucasian populations, and that adult acne is not uncommon in Chinese subjects. © 2012 Acta Dermato-Venereologica. Source


Wang X.,Peking University | Du J.,Peking University | Wang T.,Peking University | Zhou C.,Peking University | And 14 more authors.
Acta Dermato-Venereologica | Year: 2013

Vitiligo is a common skin disease, the prevalence of which varies between races and countries. In China, no population-based study has been reported, although there have been some epidemiological studies on single cities or regions. The objective of this study was to obtain the prevalence and clinical profile of vitiligo in China. The study was conducted in 6 cities. Cluster sampling was used in selecting communities. Residents were visited at home and were asked to complete questionnaires and receive dermatological examinations. A total of 19,974 residents were visited and 17,345 valid questionnaires were obtained. The overall prevalence of vitiligo was 0.56%. Men were affected more than women (0.71% vs. 0.45%, p < 0.01). The prevalence of vitiligo increased with age. The most common type was focal vitiligo (36.1%). A positive family history was found in 9.8% of patients. Thirty-two percent of patients reported a negative impact of vitiligo on their quality of life. © 2013 The Authors. Source


Ding X.,Peking University | Wang T.,Peking University | Shen Y.,Peking University | Wang X.,Peking University | And 14 more authors.
European Journal of Dermatology | Year: 2012

varies considerably between different peoples and regions. In China, a questionnaire-based study was carried out in 1987 and the prevalence of psoriasis was found to be 0.12%. Since then, no large-scale, populationbased study has been reported. Objectives: To obtain the accurate figures for the prevalence of psoriasis in China. Methods: A population-based survey was conducted in 6 cities. The cluster sampling method was used to select communities in each city. The subjects were required to fill out self-reporting questionnaires during a face-to-face interview and also received physical examination by dermatologists. Results: 19,974 subjects were visited and 17,345 completed the questionnaires and received dermatological examination. 102 subjects (0.59%) were found to have psoriasis. After standardization, the prevalence of psoriasis was 0.47%. The prevalence of psoriasis in males and females was 0.54% and 0.44% respectively. 97.06% of the patients had psoriasis vulgaris. 28.43% of the patients reported a family history of psoriasis. 59.80% of patients experienced a negative influence on the quality of life. Conclusions: This population-based and dermatologist-confirmed study showed that the prevalence of psoriasis in China is 0.47%, which is higher than that reported in 1987. Source

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