Spss version 17.0 statistical

Descriptive statistics were carried out to characterize the participants with and without CRA recurrence. Student’s t-test or Mann–Whitney U-test was carried out for difference in mean (with standard deviation) or median (with interquartile range) and chi-square test for comparison of proportion. Multivariate analysis was carried out by multiple logistic regression analysis (backward stepwise), and the result was presented as odds ratio (OR) with 95% confidence interval. All statistical analyses were carried out using SPSS Version 17.0 statistical software (SPSS Inc., Chicago, IL, USA). A two-tailed P-value <0.05 represented statistical significance.

Statistical analysis was performed using SPSS version 17.0 statistical software (SPSS Inc.). The results are expressed as mean ± standard deviation (SD). One-way analysis of variance followed by the Student-Neumann-Keuls post hoc test was used for comparison among the GC, GU and HD groups. The Student's t-test was used for comparing the NK cell ratio between cancer associated death and those who were still alive after 5 years. The correlation of NK cell levels between serum and paired tumor tissue samples was analyzed by Spearman correlation analysis. The sensitivity and specificity to identify GC and HD based on the peripheral NK cell level were analyzed and the best cutoff was determined by receiver-operating characteristic (ROC) curve analysis. The χ² test was used to determine the association between the level of peripheral NK cells and clinicopathological features. Clinical and pathological data at the time of resection were analyzed to identify factors that influenced the prognosis via the Cox proportional hazards model. Multivariate analysis was performed by the Cox proportional hazards regression model. Kaplan-Meier analysis with a log-rank test was performed to determine the overall survival (OS) of patients with GC based on the level of peripheral NK cells. P<0.05 was considered to indicate statistical significance.