Table 4.

Logistic regression of primary outcome by group assignment with stated variable forced in the model

	odds ratio	95% CI	p-value
group assignment alone	1.55	0.90–2.69	0.12
with gestational age group*	1.52	0.85–2.69	0.16
with waiver of consent	1.53	0.87–2.68	0.14
with sex of baby	1.57	0.91–2.73	0.11
with birth weight group†	1.32	0.74–2.34	0.35
with intrauterine growth restriction	1.53	0.88–2.65	0.13
with antenatal steroids	1.67	0.95–2.92	0.07
with chorioamnionitis	1.64	0.93–2.87	0.09
with sepsis	1.47	0.84–2.60	0.18
with necrotizing enterocolitis	1.46	0.83–2.55	0.19
with bronchopulmonary dysplasia treated with steroids	1.52	0.87–2.66	0.14
with maternal education‡	1.29	0.72–2.30	0.39

^*gestational age groups (< 24 weeks, 24–25 weeks & ≥ 26 weeks)

^†birth weight groups (< 500 g, 500–749 g, 750–999 g & ≥ 1000 g)

^‡high school or less vs more than high school education