Table 2.

Assessment of risk factors for reoperation using Cox regression analysis

Variable	Reoperation HR (95%CI)	P value	Valve op HR (95% CI)	P value	LVOTO HR (95% CI)	P value
Down	0.49 (0.17-1.41)	0.191	0.84 (0.21-3.37)	0.812	0.45 (0.11-1.85)	0.271
Preoperative left AV valve insufficiency		0.048		0.050		0.767
Minimal	1	0.754	1	0.801		1
Mild	1.41 (0.16-12.41)	0.787	0.73 (0.06-7.90)	0.410		0.950
Moderate	0.74 (0.08-6.36)	0.402	0.37 (0.03-3.85)	0.615		0.952
Severe	2.43 (0.30-19.60)		1.76 (0.19-16.24)			0.948
Type of AVSD	0.51 (0.20-1.28)	0.155	0.17 (0.04-0.64)	0.009	0.68 (0.16-2.88)	0.603
Years of operation		0.008		0.074		0.004
1996–2001	1	0.014	1	1	1	0.001
2002–2007	0.21 (0.06-0.72)	0.003	0.68 (0.14-3.28)	0.635	0.002 (0.00-0.09)	0.054
2008–2016	0.22 (0.08-0.60)		0.27 (0.76-0.96)	0.043	0.20 (0.04-1.02)
Associated cardiac anomalies	1.30 (0.63-2.68)	0.476	1.44 (0.55-3.75)	0.452	1.00 (0.33-3.00)	0.987
Age	0.99 (0.95-1.02)	0.686	1.03 (0.99-1.078)	0.098	0.88 (0.81-0.97)	0.009
Weight	1.03 (0.89-1.18)	0.663	0.82 (0.65-1.03)	0.095	1.37 (1.07-1.76)	0.012
Cleft closure	0.48 (0.10-2.31)	0.366	0.30 (0.03-2.62)	0.279	2.12 (0.18-23.94)	0.541
Technique	1.26 (0.59-2.68)	0.549	2.13 (0.50-9.03)	0.303	1.46 (0.60-3.57)	0.403
Postop left AV valve insufficiency	1.90 (1.25-2.88)	0.002	3.26 (1.87-5.66)	0.000	0.49 (0.23-1.05)	0.067

AV – atrioventricular, AVSD – atrioventricular septal defect, CI – confidence interval, HR – hazard ratio, LVOTO - left ventricular outflow tract obstruction