TABLE 4.

Comparison of several qualitative variables with case-control patients prior to isolation

Variable	Cases (n = 21)		Controls (n = 44)		Pb	OR (95%CI)
	n	%	n	%
Mother colonized with S. agalactiae	2	9.5	11	25	0.194	0.31 (0.06-1.58)
Rupture of amniotic sac more than 24 h before birth	7	33.3	5	11.4	0.045	3.90 (1.06-14.31)
Cesarean	8	38.1	9	20.5	0.130	2.39 (0.76-7.52)
Sex
Male	13	61.9	29	65.9	0.752	1.19 (0.40-3.50)
Female	29	65.9	15	34.1
Birth weight (<1,500 g)	7	33.3	3	6.8	0.010	6.83 (1.55-30.09)
Underlying disease	11	52.4	6	13.6	0.001	6.96 (2.07-23.46)
Previous surgery (7 days)	3	14.3	0	0	0.030	NCa
High prematurity (28-30 wk)	15	71.4	7	15.9	<0.001	13.21 (3.81-45.87)
Presence of urinary catheter	1	4.8	0	0	0.323	NC
Presence of nasogastric tube	2	9.5	0	0	0.101	NC
Presence of intravascular catheter	15	71.4	6	13.6	<0.001	15.83 (4.40-56.93)
Parenteral nutrition	15	71.4	7	15.9	<0.001	13.21 (3.81-45.87)
Intubation	18	85.7	5	11.4	<0.001	46.80 (10.07-217.53)
Administration of β-lactam antibiotics	21	100	22	50	<0.001	NC
Administration of aminoglycosides	17	81	18	40.9	0.002	6.14 (1.77-21.30)
Administration of glycopeptides	9	42.9	2	4.5	<0.001	15.75 (2.99-82.92)

^aNC, not calculable.

^bP values in boldface are statistically significant.