Results Prevalence ratio of AAD was 8.8% (31/352),and the risk of AAD was related to the kinds of using mix antibiotics and period of treatment and age.

• 结果抗生素相关腹泻的发生率为8.；8%25(31/352)；与使用抗生素种类、联合用药数量及疗程、年龄等因素有关。