问题
单项选择题
除暴露因素和疾病有关外，还存在第三个因素，该因素既是疾病的独立危险因素又与研究的暴露因素有联系，且在实验组和对照组间分布不均，由此造成的偏倚是
A．选择偏倚
B．信息偏倚
C．混杂偏倚
D．暴露偏倚
E．奈曼偏倚
答案
参考答案：C
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除暴露因素和疾病有关外，还存在第三个因素，该因素既是疾病的独立危险因素又与研究的暴露因素有联系，且在实验组和对照组间分布不均，由此造成的偏倚是
A．选择偏倚
B．信息偏倚
C．混杂偏倚
D．暴露偏倚
E．奈曼偏倚
参考答案：C
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