Table 1.

Mean (SD) of the basic characteristics in the cases and controls

Variables	Cases (N = 40)	Controls (N = 40)	P
Age, years	27.7 (6.9)	29.5 (6.7)	0.254
Parity	2.2 (2.3)	3.2 (2.8)	0.089
Gestational age, weeks	36.7 (1.9)	36.9 (1.0)	0.625
Body mass index, kg/m2	30.0 (5.8)	27.2 (4.9)	0.066
Hemoglobin, g/dl	10.9 (0.9)	11.7 (1.3)	0.004