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The mean difference of the post-test was significant at the 0.05 level.
实验组和对比组时间的平均数差异经过t检验，在0.05的水平上具有显著性。
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The positive rate of PPD test was no significant difference among each year.
各年度结核菌素阳性率差异无显著性；
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The positive rate of PPD test was no significant difference among each year.
各年度结核菌素阳性率差异无显著性；
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