[Incidence of insulin dependent diabetes mellitus in children of Shanghai, China].

A retrospective study on incidence of insulin dependent diabetes mellitus (IDDM) in children aged 1-14 was conducted in urban districts of Shanghai in 1989-1993. There were 1,401,664 children aged 0-14 in the urban area of Shanghai in 1990. 58 cases of IDDM, 28 boys and 30 girls, were traced from hospitals, primary and high schools, kindergartens and nurseries in the city during 1989 to 1993 with a "capture-recapture" method in line with DIAMOND protocol sponsored by WHO with independent validation of complete case ascertainment, with an average crude incidence of 0.83/100,000 (95% CI of 0.61/100,000-10.4/100,000), and a corrected incidence of 0.96/100,000 (95% CI of 0.71/100,000-1.18/100,000). Peak incidence of IDDM was in 1992 and at age of nine. Age of onset in boys (a median of 8.0 years) was earlier than that in girls (9.7 years). Incidence of IDDM was increasing in Shanghai as compared with the studies in 1980-1991, but it still is placed in the lowest throughout the world.