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shorter, and had smaller heads than the Oxford children. Nevertheless the sex differences in head circumference, the smoothness and general shape of the head growth curves, and the range of variation in the individual measurements are strictly comparable in the two series. It is a moot point whether the differences in absolute size are racial in origin, or whether they are due to secular changes in body size (Clements, 1953), or to different standards of nutrition.
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Barber et al. (1956) studied this question.
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