Autopsy cases of sudden unexpected infant deaths examined at the Tokyo medical examiner's office, 1964-1993.

The medical examination system in Japan covers only four regions (Yokohama, Osaka, Kobe and the 23 wards in Tokyo). In almost all other regions, it is difficult to perform reliable epidemiologic studies. This report presents a chronological analysis of sudden infant deaths, including sudden infant death syndrome, over 30 years (1964-93) in the 23 Tokyo wards.