Background There are racial differences in the prevalence and types of andr
ogenetic alopecia (AGA). There have been several reports on the prevalence
and types of AGA in the general population of caucasians, but few studies o
n Koreans with samples of sufficient numbers have been reported.
Objectives To obtain a more precise estimate of the prevalence and types of
AGA in Korean men and women and to compare the results with those in cauca
sians.
Methods The prevalence and types of AGA were analysed in 10,132 Koreans (55
31 men and 4601 women) who had visited the Health Examination Centre at Kyu
ng Hee University Hospital for regular health examinations between December
1997 and July 1999. To classify the degree of hair loss for each subject,
the Norwood classification was used in men and the Ludwig classification in
women. For AGA in men, 'female pattern' was added to the Norwood classific
ation.
Results In Korean men, the prevalence of AGA (Norwood III or above) at all
ages was 14.1%. It increased steadily with advancing age, but was lower tha
n that of caucasians: 2.3% in the third decade, 4.0% in the fourth decade,
10.8% in the fifth decade, 24.5% in the sixth decade, 34.3% in the seventh
decade and 46.9% over 70 years. Type III vertex involvement was the most co
mmon type in the third decade to the seventh decade; over 70 years, type VI
was most common. A 'female pattern' was observed in 11.1% of cases. In Kor
ean women, the prevalence of AGA (Ludwig I or above) at all ages was 5.6%.
It also increased steadily with advancing age: 0.2% in the third decade, 2.
3% in the fourth decade, 3.8% in the fifth decade, 7.4% in the sixth decade
, 11.7% in the seventh decade and 24.7% over 70 years. Grade I was the most
common type up to the sixth decade; over 60 years, grade I and II were sim
ilar in prevalence. Grade III (total baldness) was not observed. A family h
istory of baldness was present in 48.5% of men and 45.2% of women with AGA.
Conclusions The prevalence of AGA in Korean men and women was lower than th
at in caucasians, as recorded in the literature. Korean men tend to have mo
re frontal hairline preservation and show a more 'female pattern' of hair t
hinning than caucasians. Therefore, 'female pattern' should be added to the
classification of AGA.