. Author manuscript; available in PMC: 2015 Feb 1.

Published in final edited form as: Pediatr Cardiol. 2013 Sep 3;35(2):344–352. doi: 10.1007/s00246-013-0781-6

Table 4.

Logistic Regression Predictor Variables for Literacy and Mathematics Models

		Literacy			Mathematics
		Odds Ratio	95% CI	p	Odds Ratio	95% CI	p
Number of Surgeries				0.357			0.803
	One	[REFERENCE]			[REFERENCE]
	Multiple	0.68	(0.31, 1.53)		1.11	(0.48, 2.56)
Age at Surgery ^a				0.004			0.113
	Infant	[REFERENCE]			[REFERENCE]
	Neonate	3.42	(1.47, 7.97)		2.04	(0.84, 4.91)
Gender				0.395			0.066
	Female	[REFERENCE]			[REFERENCE]
	Male	0.78	(0.44, 1.39)		1.75	(0.96, 3.19)
Race				<0.001			0.001
	Non-white	[REFERENCE]			[REFERENCE]
	White	3.27	(1.74, 6.12)		3.03	(1.60, 5.71)
Cardiopulmonary Bypass				0.110			0.046
	No	[REFERENCE]			[REFERENCE]
	Yes	0.48	(0.20, 1.18)		0.38	(0.15, 0.98)
Diagnosis Group ^b				0.487			0.250
	Conotruncal	[REFERENCE]			[REFERENCE]
	LVOTO	0.95	(0.39, 2.32)		1.24	(0.50, 3.12)
	Other^c	1.67	(0.70, 3.96)		2.46	(0.99, 6.11)
	RVOTO	1.25	(0.42, 3.71)		1.22	(0.39, 3.80)
RACHS-1 Category ^b				0.539			0.231
	[1–2]	[REFERENCE]			[REFERENCE]
	[3–4]	1.45	(0.63, 3.35)		1.71	(0.72, 4.06)
	[5–6]	0.81	(0.18, 3.66)		0.81	(0.17, 3.72)
	Not Classified	1.27	(0.16, 9.90)		1.16	(0.17, 8.03)
Weight at Surgery				0.062			0.145
	25th Q. (3.3 kg)	[REFERENCE]			[REFERENCE]
	75th Q. (5.7 kg)	1.75	(0.97, 3.13)		1.58	(0.86, 2.91)
Total Time In Surgery				0.225			0.130
	25th Q. (155 min)	[REFERENCE]			[REFERENCE]
	75th Q. (315 min)	1.5	(0.78, 2.89)		1.74	(0.85, 3.54)
Length of Stay				0.026			0.026
	25th Q. (7 days)	[REFERENCE]			[REFERENCE]
	75th Q. (25 days)	0.54	(0.32, 0.93)		0.54	(0.31, 0.93)
Grade Level				0.005			0.252
	3	[REFERENCE]			[REFERENCE]
	4	1.44	(1.12, 1.86)		0.87	(0.69, 1.10)

Concordance Statistic ^d		0.73	(0.67, 0.79)		0.74	(0.67, 0.81)

CI — Confidence Interval; LVOTO — left ventricular outflow tract obstruction; RVOTO — right ventricular outflow tract obstruction; RACHS — Risk Adjustment Congenital Heart Surgery

Infant is >28 days of age at 1^st surgery, Neonate is ≤28 days of age at 1^st surgery

Deviance test reported

Other diagnosis group includes types of congenital heart disease which do not have an associated RACHS-1 category, i.e. heart transplant.

Concordance statistic assesses predictive accuracy of model and is equal to the area-under-the-curve (AUC) in logistic regression [40]