highly significantP < 0.01
Differences were considered statistically significant (*) at the 95% confidence level (P < 0.05) and highly significant (**) at the 99% confidence level (P < 0.01).
Differences were considered statistically significant (*) at the 95% confidence level (P < 0.05) and highly significant (**) at the 99% confidence level (P < 0.01).