精制蛋白衍化物（PPD）皮试显示：良性病变强阳性反应占42％，恶性病变阴性反应占48％。
PPD test showed that intense positive reaction was 42% in the benign cases, but negative response was 48% in the malignant cases.
方法采用分组对照研究的方法，检查组与对照组对结核菌素纯蛋白衍化物（PPD）试验的反应情况。
METHODS In a cross-sectional survey, we studied purified protein derivative(PPD) test in exposure group and control group.
方法采用分组对照研究的方法，检查组与对照组对结核菌素纯蛋白衍化物（PPD）试验的反应情况。
METHODS In a cross-sectional survey, we studied purified protein derivative(PPD) test in exposure group and control group.
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