Borysławski K
Ann Hum Biol. 1985 Jan-Feb;12(1):77-83. doi: 10.1080/03014468500007581.
One hundred boys and 100 girls born in Wrocław, Poland in 1964-65 and the same number of children born in 1973-75 were measured every month during the first year of life and every three months during the second. The characters investigated were body length and weight, head circumference and Rohrer's index. Generally, it seems that during the decade considered body dimensions in girls have shown slight secular increases while in boys these dimensions have remained stable or have decreased. Consequently, sex differences have decreased. Values of Rohrer's index indicate that children born in the 1970s are slimmer than those born in the 1960s. This particularly concerns girls. It seems that the explanation of these changes should be sought in the lack of improvement of the socio-living conditions and the increase of harmful environmental influences, to which boys may react quicker. With girls, the secular changes may persist for some time, since their reaction to environmental stimuli is slower.
对1964年至1965年出生在波兰弗罗茨瓦夫的100名男孩和100名女孩，以及1973年至1975年出生的相同数量儿童，在其出生后第一年每月测量一次，第二年每三个月测量一次。所调查的特征包括身长、体重、头围和罗勒指数。总体而言，在考虑的这十年间，女孩的身体尺寸似乎有轻微的长期增长，而男孩的这些尺寸则保持稳定或有所下降。因此，性别差异减小了。罗勒指数的值表明，20世纪70年代出生的儿童比60年代出生的儿童更瘦。这在女孩中尤为明显。这些变化的原因似乎应归因于社会生活条件没有改善以及有害环境影响增加，男孩对此可能反应更快。对于女孩来说，长期变化可能会持续一段时间，因为她们对环境刺激的反应较慢。
