FACTORS INFLUENCING RETENTION OF NITROGEN AND CALCIUM IN PERIOD OF GROWTH

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Abstract
Several reviews1 stressing the paucity of data on the calcium and vitamin D requirements of older children suggested the desirability of bringing together a number of determinations over a significantly long term of the retention of these two items by older girls with varying intakes. Some of these data have been reported in connection with other problems, such as the influence of puberty2 and the effect of estrogen,3 and are merely summarized in table 1 as typical of the normal balance at puberty, without ingestion of additional vitamin D and without variation in the intake of calcium. Another group of cases in this age group is reported in detail to illustrate the effect of variation in the intake of vitamin D. The comparative rarity of clinically recognizable rickets beyond infancy may account for the casual attitude of the average pediatrician toward adequate provision of calcium and vitamin

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