Retrospective Cohort Study of Adolescent Atopic Dermatitis
Epidemiological studies in Japanese children determined that the prevalence of atopic dermatitis (AD) in Japan increased through the late twentieth century, but has been declining in recent years. However, more recent evidence has revealed an increasing number of adolescent and adult subjects with AD. Many adult subjects with AD take a protracted clinical course through childhood. Furthermore, AD may develop or recur at any age. Thus, morbidity of all age ranges should be considered for estimating the prevalence of AD. Although data obtained from a prospective cohort study is reliable for determining the lifetime prevalence of AD, it takes many years to acquire the data. In contrast, a retrospective study has the advantage of a short study period while still providing a rough estimate of the lifetime prevalence of AD. Moreover, the latest demographic estimate of Japan released in 2016 showed a decreasing trend, with a total population of around 130 million people. A large change in the population would affect the result of any longitudinal epidemiological survey, and as a result, we should continue to update prevalence estimates. This chapter reviews recent studies on the prevalence of AD in Japan.
KeywordsAtopic dermatitis Prevalence Adolescent Allergic march
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