Spss 19.0 k for windows

Differences in clinical parameters by NLR and PNI status were assessed by a chi-squared test. Associations between markers of systemic inflammation and the densities of immune cells in the tumor microenvironment were evaluated by a t test or Pearson correlation by calculation of correlation coefficients. Disease-free survival (DFS) was estimated on the basis of the time between the date of surgery and the date of disease recurrence or death from any cause without recurrence. Overall survival (OS) was calculated from the date of surgery to the last follow-up or date of death from any cause. The survival rate was calculated by the Kaplan-Meier method, and statistical analysis was performed with the log-rank test. Multivariate analysis of prognostic factors was conducted with Cox's proportional hazards model. P values less than 0.05 were considered statistically significant. Statistical analysis was performed with SPSS 19.0 K for Windows (SPSS, Chicago, IL, USA).