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withoutsun

铜虫 (小有名气)

[求助] 请教一句英文,流行病学方面疾病筛查方面

The NNS was the total number of subjects in each subgroup divided by the number of subjects referred for colonoscopy and detected as having desease, according to each sigmoidoscopy-based screening strategy.
NNS是说的亚组数目除以全结肠镜检查中有病人的数目,是吗?为什么要这样定义呢?这种定义在疾病的筛查上有什么意义呢?
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