Table I.

Baseline characteristics of the two study groups

p-value	Control group (n = 512) % (no * )	Case group (n = 510) % (no * )
			Maternal age
0.324	6.6% (34)	5.80% (30)	<19 years
0.322	90.3% (462)	89.4% (456)	19-35 years
0.204	3.1% (16)	4.8% (24)	≥ 36 years
			Gestational age
0.010	8.7% (45)	10.4% (53)	<36 weeks
0.010	65.8% (337)	69.2% (353)	36-39 weeks
0.006	25.5% (130)	20.3% (104)	≥ 40 week
			Parity
0.094	63.4% (324)	59.6% (304)	1
0.083	36.2% (186)	38.9% (168)	2-4
0.112	0.4% (2)	1.5% (8)	≥ 5
			Birth weight
0.180	11.6% (60)	15.5% (79)	<2500 grams
0.179	87.0% (445)	83.0% (423)	2500-4000 grams
0.108	1.4% (7)	1.5% (8)	>4000 grams
			Maternal anemia
<0.001	2.1% (11)	45.223% (230)	Hemoglobin < 10 mg/dl

^*Number of patients