2.9. Statistical analysis
The statistical analysis was performed with SPSS 14.0 (SPSS Inc.,
Chicago, IL). The means, standard deviations and significant difference
of results were obtained by variance analysis (ANOVA). For
post hoc multiple comparisons, Duncan test was used when equal
variances were assumed, and Dunnett’s T3 was used when equal
variances were not assumed. Significance level of 0.05 was adopted
in this research.