测定阳性细胞数和平均光密度值，分析其变化趋势，并进行方差分析和t检验。
The number of positive cell and mean of optical density were detected and the trend change was analyzed. The variance analysis and t-test were also performed.
测定阳性细胞数和平均光密度值，分析其变化趋势，并进行方差分析和t检验。
The number of positive cell and mean of optical density were detected and the trend change was analyzed. The variance analysis and t-test were also performed.
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