Table 4.

Conditional logistic regression on risk factors of neonates acquiring early-onset sepsis

	Unadjusted model			Adjusted model (Full model)			Adjusted model* (Forward stepwise model)
	OR	95% CI	p value	OR	95% CI	p value	OR	95% CI	p value
Maternal factors
Maternal fever	2.96	1.35 to 6.47	0.007	1.76	0.71 to 4.35	0.224
Chorioamnionitis	17.19	6.33 to 46.67	< 0.001	8.74	2.97 to 25.71	< 0.001	8.99	3.07 to 26.33	< 0.001
Maternal genitourinary tract infections	2.55	1.79 to 3.64	< 0.001	1.85	1.22 to 2.81	0.004	1.85	1.22 to 2.80	0.004
Maternal group B streptococcus (GBS) colonization	1.13	0.83 to 1.52	0.443	1.15	0.85 to 1.57	0.375
Maternal pneumonia	16.89	6.77 to 42.12	< 0.001	16.75	6.57 to 42.69	< 0.001	17.35	6.85 to 43.90	< 0.001
Premature rupture of membranes (PROM)	1.61	1.28 to 2.04	< 0.001	1.69	1.33 to 2.15	< 0.001	1.69	1.32 to 2.15	< 0.001
Delivery by Cesarean section	1.64	1.46 to 1.83	< 0.001	1.47	1.29 to 1.67	< 0.001	1.45	1.28 to 1.64	< 0.001
Maternal systemic lupus erythematosus (SLE)	1.61	0.76 to 3.43	0.213	1.17	0.52 to 2.60	0.706
Maternal diabetes mellitus	1.86	1.46 to 2.36	< 0.001	1.97	1.53 to 2.53	< 0.001	1.95	1.52 to 2.51	< 0.001
Maternal antibiotics usage	1.55	1.37 to 1.75	< 0.001	1.32	1.16 to 1.50	< 0.001	1.33	1.17 to 1.52	< 0.001
Steroid (betamethasone or dexamethasone) usage	1.93	1.19 to 3.13	0.008	1.20	0.72 to 1.99	0.480
Neonatal factors
Gestational age (weeks)	0.86	0.82 to 0.91	< 0.001	1.02	0.96 to 1.08	0.558
Birth weight (per 100 g)	0.99	0.99 to 0.99	< 0.001	0.99	0.99 to 0.99	< 0.001	0.99	0.99 to 0.99	< 0.001
Birth injury	0.75	0.22 to 2.53	0.642	0.70	0.17 to 2.90	0.622
Meconium aspiration syndrome (MAS)	1.09	0.41 to 2.87	0.862	0.38	0.08 to 1.75	0.214

^*The Hosmer-Lemeshow test was 0.72, and the area under the curve was 0.621