Variations of Growth in Weight of Elementary School Children, 1921-28

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Abstract
A study of the fluctuations of annual growth in weight of about 2500 elementary school children during the years between 1921 and 1928, and a presentation of standard measurements with which growth in other calendar years, particularly the recent years of the economic depression, may be compared. With the exception of a few groups, the average weights of children of given age did not vary significantly from year to year during the 7-year period. Average annual weight increments showed a systematic and statistically significant fluctuation during the 7-year interval. The most divergent year, May 1924 to May 1925, was an inferior "growing" year, weight increments averaging approximately 92% of the standards based on 7 consecutive annual measurements. The best "growing" year, 1926-27, showed an average increment of over 105% of the 7-year standards.

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