Statistical analysis
Data analysis using SPSS19.0 software.Measurement data consistent with a normal distribution are expressed asx ± s , and comparison between groups is made witht -tests. For statistical analysis, the Kruskal-Wallis test wasused for paired numeric data, the Mann-WhitneyUtest forunpaired numeric data, and the chi-squared test for categorical variables.AP -value lower than 0.05 by two-tailedanalysis was accepted as statistically significant.