2.9. Statistical analysis
The statistical analysis was performed with the SPSS software package (version 17.0, SPSS, Chicago, IL., USA). The bacterial size differences among the cell-treated groups were evaluated using one-way analysis of variance (ANOVA) and the multiple comparison between the cell-treated groups were determined using Tukey’s HSD. The effect of the same compound at different concentrations was analyzed using repeated measures ANOVA. Pvalues less than 0.05 were considered significant.