Table 3.

Risk factors associated with ICU admittance.

	Univariate (n = 267)					Multivariate (n = 262)
	Yes		No		P value	OR (95%CI)	P value
	Total	Value	Total	Value
Atropine	195	18 (9.2%)	72	16 (22.2%)	0.005
Steroid	183	19 (10.4%)	84	15 (17.9%)	0.089
Muscle relaxant	144	9 (6.2%)	123	25 (20.3%)	0.001
Intubation	193	19 (9.8%)	74	15 (20.3%)	0.022
Intravenous induction	130	8 (6.2%)	137	26 (19.0%)	0.002
Hemoglobin concentration (g/L)	95.6 ± 15.5		108.2 ± 17.5		0.000
Gestation age at birth (weeks)	30 (28, 32)		30 (29, 32)		0.290
Post conceptual age (weeks)	40 (37, 42)		48 (41, 56)		0.000
Body weight at birth (kg)	1.0 (1.0, 2.0)		1.4 (1.0, 2.0)		0.191
Body weight at surgery (kg)	2.0 (2.0, 4.0)		5.0 (3.0, 7.3)		0.000	0.330 (0.195-0.558)	0.000