Statistics:
Continuous data were presented as means with standard deviation and categorical data were presented as proportions. Kaplan-Meier statistics were used to display time to reintervention. A multivariable proportional hazard modeling was used to identify the influence of preoperative and operative variables on the need for reintervention. Longitudinal data analyses with mixed effect modeling were used to display and identify predictors of the progressive changes in the pressure gradient following repair. The statistical software system SAS, version 9.4, Cary, USA, was used for all statistical analyses.