Statistics
SPSS 22.0 statistical software was used to analyze the data. All
measurement data were tested for normality. The measurement data
conforming to normal distribution were compared between the two groups
by independent sample t test, and the data were expressed by± s ; The measurement data that did not conform to the normal
distribution were expressed by M (P25, P75) , and the
nonparametric Wilcoxon rank sum test was used for comparison between
groups. P < 0.05 was statistically significant.