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Abstract: 5913 Zhejiang children, aged from 5 to 18, have been measured in 1951. The measurements applied consist of stature, body weight, span, sitting height, trunk height and 3 chest circumferences taken in statical, inspiratory and expiratory states. The statistical constants have been tabulated and analyzed as following:1. There is a period of rapid growth during the age of 11—16 in the male and 10—15 in the female. The beginning and declining of this period of the female are earlier than that of the male (one year earlier in the beginning, and 1—3 years earlier in the declining).2. The growth of stature is faster than that of chest circumference before the puberty, and slower during puberty, in both sexes; the growth rate of weight is considerably greater than that of the stature and the chest circumference, throughout all ages in both sexes.3. The changes in the coefficient of variability are closely associated with that of the growth rate. This indicates that the individual variation is more marked during the period of rapid growth.4. The growth of stature is slower than that of the span. The measurement of the stature of the male is greater than the span before the age of 15, and smaller after the age of 16; the measurement of the stature of the female is greater than the span until the age of 18.5. The ratio of the trunk height to the stature seems constant throughout all ages between 5—18, which is about 0.34—0.35 in both sexes; while that of the head-and-neck decreases gradually with age, and that of the leg increases gradually with age. These later tendencies appeares to be more pronounced in the male than the female.6. The development of the difference between inspiratory and expiratory chest circumference shows a liner tendency in both sexes, before the age of 13. The sex difference appeared at the age of 14; after that, the male figure is markedly larger than that of the female.

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