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The age-change patterns in the intra-pair similarity were analysed of 216 twins about 4 metric traits for the age span from 7 to 17 years old. Patterns were discriminated into 6 types (A, B, C, D, E, F, ) according to the criterion set based on standardized RPD which was defined by the present authors in 1980. In all types but A, the intra-pair difference is markedly large in dizygotic twins (DZ) than in monozygotic twins (MZ). Types D, E, F in which the difference is large at the final age are far more frequent in DZ than in MZ. Type B in which the difference is for a while passingly large is considered to be brought about from the intra-pair discrepancy of the age at peak velocity, and the largeness of this discrepancy of DZ is three times as large as that of MZ in case of the stature. More than two thirds of type-A MZ in one trait are judged as the same type in the other 2 or 3 traits, but in DZ there is no such pair in types A and B. It seems true that the features of adolescent spurt is more sensitive to the minute difference of environmental conditions rather than the final absolute size of the body is.

Age Changes in Intra-Pair Similarities of Japanese Twins with Regard to Stature, Body Weight, Chest Girth and Sitting Height