Table 2.

Covariates Used in Cox Regression Analysis of Survival Among 635 Patients from the CDH Study Group Registry

		95% CI
Covariates found to be significantly associated with mortality (included in regression model)	hazard ratio	lower	upper	Wald χ2 (df=1)	P
Repair on ECMO vs. repair after ECMO	1.41	1.03	1.92	4.60	0.03
Birth weight	0.64	0.49	0.84	10.49	0.00
Apgar score at five minutes	0.93	0.87	0.99	4.67	0.03
Left-sided defect vs. right-sided	1.66	1.14	2.41	7.08	0.01
ECMO run length	1.04	1.02	1.06	11.62	0.00
Primary repair vs. patch repair	0.59	0.37	0.94	4.89	0.03
Covariates not found to be significantly associated with mortality (excluded from regression)*				Wald χ2 (df=1)	P
Year of birth				<0.01	0.96
Inborn vs. outborn status				0.28	0.59
diaphragmatic agenesis				0.25	0.62
Presence of major cardiac abnormalities				0.50	0.48
Presence of chromosomal abnormalities				0.81	0.37
Days of life at repair				1.34	0.25

^*(no hazard ratio calculated since these variables are not part of the regression model)