Table 3

Univariable association between candidate predictors and outcome

Candidate predictor	Coefficient	SE	OR	95% CI	P value
Infant risk factors
Gestational age (weeks)	0.067	0.026	1.07	1.02–1.12	0.009
Birth weight (kg)	0.131	0.087	1.14	0.96–1.35	0.1
Maternal risk factors
Maternal fever	1.79	0.544	5.99	2.06–17.4	0.001
Offensive liquor	0.707	0.208	2.03	1.35–3.05	0.001
PROM	0.391	0.173	1.48	1.05–2.08	0.02
Infant clinical features
Grunting at triage	0.203	0.132	1.23	0.95–1.59	0.1
Respiratory rate (5 breaths/min)	0.093	0.022	1.10	1.05–1.14	<0.001
Heart rate (5 beats/min)	0.047	0.019	1.05	1.01–1.09	0.01
Temperature (°C)	0.886	0.087	2.42	2.04–2.88	<0.001
Activity
Alert—lethargic	0.395	0.162	1.48	1.08–2.04	0.02
Alert—other	1.05	0.25	2.86	1.75–4.67	<0.001
Nasal flaring	0.290	0.126	1.34	1.04–1.71	0.02
Chest retractions	0.417	0.124	1.52	1.19–1.93	0.001
Grunting	0.346	0.155	1.41	1.04–1.92	0.03
Work of breathing
Normal—mildly increased	−0.207	0.197	0.81	0.55–1.20	0.3
Normal—moderately increased	0.345	0.146	1.41	1.06–1.88	0.02
Normal—severely increased	0.674	0.217	1.96	1.28–3.00	0.002

Analyses were performed on the complete data after multiple imputation of missing values.
PROM, prolonged rupture of membranes;