Statistical analysis
Continuous variables are reported as median (interquartile range [IQR]), and categorical variables are reported as number (percentage). The temporal trend in operative mortality over the study period was visualized with a Loess smoothing estimator and was formally tested with a Wilcoxon rank sum test. Long-term mortality was depicted graphically using the Kaplan-Meier estimator, and the reverse Kaplan-Meier method was used to summarize follow-up time. The unadjusted association between select baseline factors and mortality was assessed in univariable Cox proportional hazards models. Because few of the patients (3 patients) underwent completion pericardiectomy, this group was combined with the radical pericardiectomy group. These analyses were done in SAS version 9.4 (SAS Institute, Cary NC).