Methods According to the criterion of ZPP divided 306 young children cases into 2 groups, one for normal, another iron deficiency. Calculation RDW distribution, sensitivity, speciality, ROC curve and imitate ratio, respectively.

• 方法 以ZPP 为指标,将不同年龄组的306 例婴幼儿分为正常组和缺铁组,分别计算RDW 的分布及敏感性、特异性、ROC 曲线和拟然比。