On the Approximation of the Calculated to Determined Calcium Content of Human Dietaries

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Abstract
The calcium content of sixteen low calcium diets and twelve intermediate and high calcium diets was determined by analysis. The results were compared with the dietary calcium content as computed by reference to tables giving mean calcium contents of the component foodstuffs. In twenty-two of twenty-eight observations, Sherman's revised ('37) tables gave better agreement between calculated and found values than did earlier figures. A disproportionate number of calculated estimates, however, whether based upon earlier or upon revised data, exceeded the determined values, the positive deviation being greater than 25% of the calculated value in ten of sixteen low calcium diets.