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【单选题】
下列关于患病率的论述正确的是A.
患病率一般用来描述病程较长的慢性病存在或流行的频率,说明此类疾病流行的公共卫生学意义,对于急性病和病程短的疾病价值不大
B.
患病率计算时的分子是一定时期内的新旧病例数
C.
在对不同地区进行患病率的比较时,应考虑年龄、性别等的构成,进行率的标准化
D.
在发病率、病程均稳定的情况下,患病率等于发病率乘以病程
E.
以上都正确
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A.
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B.
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C.
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D.
All of them above.
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