2.2 Statistical analysis
Statistical analysis was performed by IBM SPSS Statistics 23.0. Frequencies and proportions were used to express categorical variables and continuous variables were mean ± standard deviation or medians and interquartile ranges (IQRs). Comparisons continuous data between two groups (TAPVC repair group and non-TAPVC repair group) are made by the Student unpaired t test or the Mann-Whitney U test, and comparisons categorical data by the χ2 test. Survival probabilities were calculated using Kaplan-Meier curve. Risk factors for mortality in all cases (n = 43) were analyzed by Cox hazard models. Cox proportional hazard modeling and log-rank test were used for COX univariable analysis, and variables were entered into the COX multivariable analysis if p value < 0.1. All pvalue < 0.05 were considered significant.