Univariate and multivariate Cox regression analysis of factors associated with postoperative recurrence (stepwise method).

Note: Multivariate analysis was performed using the Cox multivariate proportional hazard regression model with a stepwise method (forward, likelihood ratio); NA, not assessed; NS, not significant; AF, atrial fibrillation; PV, pulmonary vein; LSPV, left superior pulmonary vein; LIPV, left inferior pulmonary vein; RSPV, right superior pulmonary vein; RIPV, right inferior pulmonary vein; OLPV, overall left pulmonary vein; ORPV, overall right pulmonary vein; OSPV, overall superior pulmonary vein; OIPV, overall inferior pulmonary vein; LAD, left atrial diameter.