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Resumo

Sibling correlations are reported for Fels skeletal ages from 2,622 mixed longitudinal hand‐wrist radiographs of 285 boys and 276 girls. Because the observed correlations were irregular across age, they were smoothed by using kernel regression. The brother‐sister correlations were generally lower than those for the other types of silbling pairs, but they were similar to the brother‐brother correlations after 11 years. The sister‐sister correlations were considerably higher than the brother‐brother and brother‐sister correlations after 12 years. The present data do not provide clear evidence of involvement of the X chromosome in the timing of skeletal maturation, but after 12 years the present data suggest such an involvement.

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