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调查1995年苏州地区215树佝偻病婴儿发病与喂养方式、添加VitD制剂的关系．结果表明：母乳喂养组发病率明显低于人工喂养组及混合喂养组；按时添加VitD制剂组的发病率也明显低于未按时添加VitD制剂组．
To investigate the relationship between incidence and feeding of 215 trees in Suzhou area in 1995 and the addition of VitD. The results showed that: the incidence of breastfeeding group was significantly lower than the artificial feeding group and mixed feeding group; the incidence of vitamin D group was significantly lower than the group did not add vitamin D preparation group.