Table 3.

Descriptive statistics of pregnancies in women from different altitudes of Peru, 2003–2006

Place (altitude)	Number of Pregnancies	Hemoglobin, g/dl Means ± SD	Prevalence of Hb, <11 g/dl n % CI 95%	Prevalence of Hb, >14.5 g/dl n % CI 95%	Mean Birth Weight, g, ±SD	Stillbirths n % CI 95%	Preterm n % CI 95%	SGA n % CI 95%
Lima, 150 m	8409	11.28±1.15	2804	15	3260±553	64	539	721
			33.3	0.2		0.8	6.4	8.6
			(32.3–34.3)	(0.09–0.29)		(0.66–1.17)	(5.89–6.95)	(7.99–9.19)
Huaraz, 3070 m	10,279	12.84±1.36	747	1063	3065±548	215	857	1635
			7.2	10.3		2.1	8.3	15.9
			(6.77–7.78)	(9.75–10.9)		(1.82–2.38)	(7.80–8.88)	(15.2–16.6)
Huancayo, 3280 m	6613	13.55±1.34	196	1646	3040±499	125	493	1417
			3.0	24.9		1.9	7.5	21.4
			(2.68–3.40)	(23.8–25.9)		(1.57–2.24)	(6.83–8.11)	(20.4–22.4)
Cuzco, 3400 m	2995	13.61±1.42	97	710	3090±506	64	175	538
			3.2	23.7		2.1	6.0	17.9
			(2.63–3.93)	(22.2–25.3)		(1.64–2.72)	(5.02–0.74)	(16.6–19.3)
Huancavelica, 3640 m	2202	13.92±1.57	75	800	2930±519	91	228	550
			3.4	36.3		4.1	10.4	25.0
			(2.68–4.25)	(34.1–38.3)		(3.34–5.04)	(9.11–11.7)	(23.1–26.8)
Puno, 3800 m	2744	13.53±1.45	89	642	3100±527	56	184	433
			3.2	23.4		2.0	6.7	15.7
			(2.61–3.97)	(21.8–25.0)		(1.54–2.64)	(5.79–7.70)	(14.4–17.1)
Cerro de Pasco, 4340 m	2207	14.46±1.83	72	1184	2838±468	51	404	717
			3.3	53.6		2.3	18.3	32.4
			(2.56–4.09)	(51.5–55.7)		(1.72–3.02)	(16.7–19.9)	(30.5–34.4)
Overall population	35449	12.89±1.70	4080	6060	3089±541	666	2880	6011
			11.5	17.1		1.9	8.1	16.9
			(11.2–11.8)	(16.7–17.5)		(1.73–2.02)	(7.84–8.41)	(16.5–17.3)

CI 95%, 95% confidence interval; SGA, small for gestational age. n = number of subjects with the characteristic.