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withoutsun銅蟲 (小有名氣)
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[求助]
請教一句英文,流行病學方面疾病篩查方面
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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是說的亞組數(shù)目除以全結(jié)腸鏡檢查中有病人的數(shù)目,是嗎?為什么要這樣定義呢?這種定義在疾病的篩查上有什么意義呢? |
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