试题与答案

一项探讨母亲围产期放射暴露与儿童白血病关联的病例对照研究数据如下:200例儿童白血病

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题目:

一项探讨母亲围产期放射暴露与儿童白血病关联的病例对照研究数据如下:200例儿童白血病患者有30例的母亲在孕期接受放射诊断,400例对照儿童的母亲只有20位在孕期接受过放射诊断

X2值为

A.16.17
B.17.45
C.18.56
D.14.73
E.19.60

答案:

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