Statistical analysis
All data were statistically analysed by SPSS 22.0 software. The categorical variables were represented as percentage and analysed using the chi-square test. The continuous numerical variables were represented as mean ± standard deviation (-x ± s). The independent t test was used for comparison between groups at the same time point, and the paired t test was used for comparison within groups before and after nursing. P<0.05 indicated that a difference was statistically significant.