highly significantP < 0.001
By the general criteria of statistical field, the differences are considered to be statistically significant at P < 0.05, when P > 0.05, it is considered that there is no statistically significant difference between groups, by “ns”; when P < 0.05, there is a statistically significant difference between groups, indicated by (*); P < 0.01 indicates highly significant intergroup difference, indicated by (**); and P < 0.001 is an extremely significant difference, marked with (***).