The data was analysed for Dunnett t test using SPSS13.0 software package.

采用SPSS13.0统计学软件进行组间方差分析。

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There was significant difference between two groups by using Student t test(P<0.05).

经配对t检验表明二者间有显著性差异（P<0.05）；

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There was significant difference between two groups by using Student t test(P<0.05).

经配对t检验表明二者间有显著性差异（P<0.05）；

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