Skeletal maturity of the hand and wrist in Japanese children in Sapporo by the TW2 method.

Skeletal maturity of Japanese children aged 6--18 years in Sapporo was compared with that of Japanese children in Toko, as well as with that of British children, by the TW2 method. In Sapporo children, the mean skeletal age was in advance of the chronological age after ages 12 years in boys and 10 years in girls. The ages at which the skeletal age preceded the chronological age occurred earlier in the children in Tokyo than in Sapporo. The hand and wrist bones completed maturation about the same age in both Japanese and British children. Somatometric and radiological results agreed exactly.