1.6 Data Analysis
Data were analyzed by SPSS 24.0 statistical software (IBM Corporation,
Armonk, NY, USA). 95% confidence intervals (CIs) were calculated for
means and percentages. Curves of PFS, DMFS, LNRFS, LRFS, NRF and OS were
estimated with the Kaplan–Meier method (GraphPad Prism 8.0.1). Group
frequency data were examined using Chi-squared tests. Multivariate Cox
regression analysis and Log-rank tests were used for survival
correlation factors and inter-group curve comparisons, respectively.