某一项为期5年的医院控烟项目,在过程中由于卫生部出台了要求医院开展控烟工作的政策而影响了对于项目效果的评价,这是属于影响评价因素的
A.时间因素
B.工作人员和参与者的成熟性
C.回归因素
D.测量工具
正确答案是A
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