In order to obtain the sensitivity and the specificity, which are useful for practice, it is necessary that a subsample should be selected in the screened negative subjects for diagnoses.
为了获得有实用价值的灵敏度及特异度，在筛查阴性者中抽取一定比例样本进行诊断试验是必要的。
In order to obtain the sensitivity and the specificity, which are useful for practice, it is necessary that a subsample should be selected in the screened negative subjects for diagnoses.
为了获得有实用价值的灵敏度及特异度，在筛查阴性者中抽取一定比例样本进行诊断试验是必要的。
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