Table 3. Cox regression model to predict late onset AF.

Variable	Univariate analysis			Multivariate analysis
	HR	95% CI	P-value	HR	95% CI	P-value
Age	1.04	1.03–1.06	< 0.001	1.05	1.02–1.09	< 0.001
Male gender	0.83	0.44–1.56	0.563
LAD	1.15	1.05–1.29	0.012	1.23	1.08–1.36	0.005
Myxoma dimension	1.22	0.83–1.61	0.465
Myxoma location	1.43	0.76–2.05	0.679
History of AF	1.18	0.92–1.42	0.247
Surgical ablation	0.95	0.82–1.06	0.086
Mitral valve surgery*	1.28	1.12–1.41	0.027	1.17	1.05–1.29	0.032

*Mitral valve surgery refers to the mitral valve repair/replacement. AF: atrial fibrillation; LAD: left atrial diameter.