To the Editor.—
As director of a survey concerned only with preschool children (12 to 72 months old), I wish to offer additional comments on some aspects of Dr. Crosby's COMMENTARY (228:1651, 1974). Unlike the sampling in the Ten-State Nutrition Survey, that in the Preschool Nutrition Survey was cross-sectional in nature and, therefore, youngsters of all socioeconomic levels were represented.1 Further, all the hemoglobin, hematocrit, and plasma iron determinations in the preschool survey were made in one laboratory.Hemoglobin and hematocrit data that pertained to children in the lowest socioeconomic level of the preschool survey were strikingly similar to those of children in the Ten-State Survey,1 especially when one takes into consideration differences in proportions of black and white children represented in the two surveys (J Pediatr 82:850, 1973). Although prevalence of anemia, arbitrarily defined, was greater among poor children than among those more economically favored, approximately 20% of all
Owen GM. Nutrition Surveys. JAMA. 1974;230(9):1255. doi:10.1001/jama.1974.03240090015008
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