FIGURE D-3 The effect of correlation between usual intake and requirement on the prevalence of inadequate intakes estimated using the Estimated Average Requirement (EAR) cut-point method for 10 values of the correlation. For all correlations, mean intake = 90, standard deviation (SD) of intake = 30, EAR = 55, and SD of requirement = 30 units.

NOTE: When the SD of requirement is as large as the SD of intake, the estimate of prevalence of inadequate intakes using the EAR cut-point method shows significant bias even when the correlation between intake and requirement is zero.