在一项病例对照研究中,500个病例中有暴露史者400人,而500个对照中有暴露史者1 发布时间:2019-02-22 14:17 │ 来源:www.tikuol.com 题型:单项选择题 问题: 在一项病例对照研究中,500个病例中有暴露史者400人,而500个对照中有暴露史者100人。有暴露史者的发病率为()A.20%B.40%C.80%D.100%E.无法计算
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