Spss statistic for windows version 21

Statistical analyses were performed using IBM SPSS Statistic for Windows, version 21 (IBM Corp., Armonk, NY, USA). Baseline characteristics are presented as proportions for categorical variables and the mean ± standard deviations for continuous variables. Chi-squared analysis was used for categorical variables, and t-tests were used for continuous variables. The end date was the date of death or the date of the last follow-up. Hazard ratios (HRs) and 95% confidential intervals (CIs) for overall survival were estimated using Cox regression analysis. Variables with probability thresholds (P) < 0.05 from the univariate analysis were included in multivariate regression models and backward elimination. A multivariate P value less than 0.05 was considered statistically significant. Kaplan–Meier curves and log-rank testing were used to analyze the overall survival data.

Statistical analyses were performed using IBM SPSS statistic for Windows, version 21 (IBM Corp., Armonk, NY). The analysis was conducted by dividing individuals into three age groups (15–29, 30–59 and > 59years old). Rate of RV infection was compared between three periods of time (July 2016-June 2017, July 2017-June 2018, July 2018-December 2019). A Chi-square table was used to compare the percentages of infected individuals between age groups and studied periods. All comparisons were two-sided and p-value < 0.05 was considered to be statistically significant.