๐ ็ธฝ็ฎ้ ๏ฝ ๐ ่ฑๆๅๆ๏ผๆฌ็ฏ๏ผ ๏ฝ ๐ ๅฎๆด็ฟป่ญฏ ๏ฝ โญ ็ฒพ่ฏ็ญ่จ
EPIDEMIOLOGY
Dermatomyositis is a relatively rare disease that occurs throughout the world. In adults, dermatomyositis affects women two to three times more often than men. The incidence of dermatomyositis ranges from 2 to 9 per million amongst various populations and seems to be increasing, although this may simply be a result of increased detection, as well as better diagnosis and reporting. Table 42.2 summarizes the demographic findings from five series of patients with dermatomyositis6,9โ11,11a.
Table 42.2 Clinical subtypes of dermatomyositis โ demographics and associated findings.