Table 1.

The characteristics of newborns with symptoms of infections and E. coli infections

	Infants without infections [N = 890]		Infants with other infections [N = 782]		OR	95% CI	P*-value	Infants with E. coli-infections [N = 96]		OR	95% CI	P**-value
Risk factors	Average	95% CI	Average	95% CI				Average	95% CI
Birth weight	1091.4	[1072.4, 1110.4]	991.1	[971.9,1010.2]	NA		<0.0001	909.1	[858.6, 959.6]	NA		<0.0001
Gestational age	29.1	[28.8, 29.3]	28.0	[27.8, 28.2]	NA		<0.0001	27.0	[26.5, 27.6]	NA		<0.0001
CRIB	4.5	[4.1, 5.0]	4.4	[4.0, 4.8]	NA		-	5.5	[4.1, 6.8]	NA		-
Apgar (1 min.)	5.5	[5.3, 5.6]	5.3	[5.2, 5.4]	NA		<0.0001	4.8	[4.4, 5.2]	NA		<0.0001
Apgar (5 min.)	6.0	[5.9, 6.2]	6.0	[5.9, 6.2]	NA		-	5.7	[5.3, 6.1]	NA		<0.0001
Number and percentage of population
Female gender	438	49.2	350	44.8	1.19	0.986-1.45	-	44	45.8	0.96	0.626-1.465	-
Caesarean section	731	82.1	624	79.8	1.03	0.803-1.326	0.0002	62	64.6	2.17	1.377-3.408	<0.0001
Breast feeding	64	7.2	44	5.6	1.29	0.874-.932	-	3	3.1	5482	0.563-6.071	-
Trophic feeding	295	33.1	310	39.6	0.75	0.618-0.922	0.008	42	43.8	0.84	0.550-1.295	<0.0001
Total parenteral nutrition	319	35.8	409	52.3	0.51	0.419-0.619	<0.0001	56	58.3	0.78	0.509-1.203	<0.0001
Perinatal antibiotic prophylaxis	335	37.6	344	44.0	0.77	0.632-0.935	0.009	46	47.9	0.85	0.558-1.305	<0.0001
Death of the patient	209	23.5	64	8.2	3.44	2.553-4.643	<0.0001	14	14.6	0.52	0.280-0.972	<0.0001
Infants born from deliveries where the following were diagnosed during the mother’s pregnancy:
PROM	185	20.8	211	27.0	0.71	0.566-0.890	0.0008	33	34.4	0.71	0.449-1.106	<0.0001
Chorioamnionitis	62	7.0	60	7.7	0.90	0.623-1.303	-	13	13.5	0.53	0.279-1.000	<0.0001

P* value: analysis of infants without infection versus those with non-E. coli infections.

P** value: analysis of infants with non-E. coli infections versus infants with E. coli infections.

CRIB, clinical risk index for babies.