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et al.59 found a larger sex difference in adult height (D = 14.2 cm), mainly due to a relatively more important adolescent gain than in the British children, whereas data for the Belgian population show, such as for the British children, a relatively larger contribution of DT to the sex differences in adult height.60 Table 3-2 shows that the decomposition of adult sex differences in sitting height is percentagewise table 3-2 Decomposition of Sexual Dimorphism in Adult Size of Height, Sitting Height, Shoulder Width, and Hip Width into Three Additive Components (see text for explanation of abbreviations): A British Sample

Height (cm) Sitting Height (cm) Shoulder Width (cm) Hip Width (cm)

similar to that seen for stature. On the contrary, for shoulder width boys have a relatively larger increase during adolescence than girls. As far as hip width is concerned, adult sex differences are almost negligible. Prepubertal differences in hip width are also nonexistent, and the greater adolescent gain in hip width of the girls (DA = -1.0 cm) is counterbalanced by the amount of growth in hip width of boys due to their prolonged prepubertal growth period. In conclusion, it can be said that the adult sex differences in longitudinal body dimensions are attributable mainly to the boys' longer prepubertal growth cycle. Sex differences in shoulder width is in equal amounts due to the delay in onset of the growth spurt and greater adolescent gain in the boys. Finally, sex differences in hip width are negligible in adulthood and also before puberty. The slightly greater increase in hip width during adolescence by the girls is largely compensated for by the boys' gain in hip width during their longer prepubertal period.

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