2.7. Statistical analysis
All samples were evaluated for one parameter before proceeding
to the next which allowed for more accurate comparison of
individual parameters. Mean scores were used for objective evaluation
of histological changes. The datawas statistically analyzed by
Kruskal–Wallis test using commercial software (GraphPad Prism
Version 4, GraphPad Software, San Diego, CA). Differences were
considered to be statistically significant at P < 0.05.