Table 5.

Model for logistic regression assessing risk of still birth, preterm, and small-for-gestational age according to maternal hemoglobin value in pregnant women at Peruvian low altitudes: 2003–2006

Hemoglobin, g/dl	Stillbirths (64)			Preterms (539)			SGA (721)
	n	%	OR Adjusted	n	%	OR Adjusted	n	%	OR Adjusted
	(CI at 95%)		CI at 95%	(CI at 95%)		CI at 95%	(CI at 95%)		CI at 95%
<9	2	0.88	1.41	29	12.83	1.85	34	15.04	1.79
	(0.10–0.31)		0.32–6.13	(8.76–17.9)		1.18–2.90	(10.6–20.3)		1.21–2.64
9–10.9	28	1.09	1.73	166	6.44	1.08	207	8.03	0.91
	(0.72–1.56)		1.01–2.96	(5.52–7.45)		0.89–1.33	(7.0–9.14)		0.76–1.09
11.0–12.9	30	0.61	1.00	297	5.99	1.00	422	8.51	1.00
	(0.40–0.86)			(5.34–6.68)			(7.75–9.32)
13.0–14.4*	4	0.63	1.09	46	7.26	1.22	57	8.99	1.10
	(0.17–1.60)		0.38–3.26	(5.36–4.55)		0.88–1.70	(6.88–11.4)		0.82–1.47

Model adjusted by age, educational status, body mass index, parity, gestational hypertension, health care, and previous perinatal mortality. n = number of cases with fetal adverse outcome. Trimester of gestational age at first hemoglobin measurement was controlled.

^*Number of pregnancies and adverse outcomes with Hb >14 too small to analyze.