Statistical analysis
SPSS 26.0 software and R version 3.6.1 were applied to analyze the data. The measurement data were displayed in the form of mean ± standard deviation, and the comparison between the two groups was carried out using independent samples t-test. The classification data have been presented in the form of numbers and percent (%). The comparison between the two groups was performed using Chi-square test, and Fisher's test was used when the exact probability met.