Table 1.

Socio-Demographic and Reproductive Characteristics and Infant Outcomes in the Study Population, Lima, Peru, 2009-2010

Characteristics	Placental Abruption				P-value
	Controls (n=160)		Cases (n=164)
	n	%	n	%
Maternal age at delivery (years)	27.6 ± 5.8*		28.2 ± 6.5*		0.37
<20	10	6.3	13	7.9	0.66
20-29	88	55.0	80	48.8
30-34	36	22.5	38	23.2
≥35	26	16.2	33	20.1
Primiparity	75	46.9	74	45.1	0.75
≤High school education	111	69.4	112	68.3	0.83
Employed during pregnancy	63	39.4	63	38.4	0.86
Planned pregnancy	105	65.6	110	67.1	0.78
No prenatal care	8	5.0	24	14.6	0.004
No prenatal vitamin	30	18.8	36	22.0	0.47
Smoking during pregnancy	0	0.0	1	0.6	---
Alcohol use during pregnancy	61	38.1	51	31.1	0.18
Illicit drug use during pregnancy	0	0.0	4	2.4	---
Pre-pregnancy weight (kg)	57.5 ± 9.2*		57.6 ± 9.0*		0.90
Infant birthweight (grams)	3348 ± 463*		2404 ± 928*		<0.001
Low birthweight (<2500 g)	7	4.4	86	52.4	<0.001
Preterm delivery (<37 weeks)	1	0.6	86	52.4	<0.001
Hours of sleep per night	7.4 ± 1.2*		7.4 ± 1.5*		0.91
Ever complaint of vital exhaustion	90	56.3	123	75.0	<0.001

^*Mean ± SD (SD: standard deviation)