We used SPSS 22.0 software for statistical analysis. Our data was expressed as mean ± standard deviation, percentage, or median (25th-75th percentile) for follow-up period. Continuous and categorical variables between groups were compared by independent samples t test and Chi-square test, respectively. The significant variables in the univariate analysis were selected for multivariable analysis. Time to the CV and overall mortality events and covariates of risk factors were modeled using the Cox proportional hazards model with forward selection. The incremental value of CHADS2, R2CHADS2, and CHA2DS2-VASc score over conventional parameters to assess the risk for CV and all-cause mortality were studied by calculating the improvement in global chi-square. Kaplan-Meier survival plots were calculated from baseline to time of mortality events. All tests were 2-sided and the level of significance was established as P < 0.05.

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