Maternal and Perinatal Outcomes in Second Hemoglobin Measurement in Nonanemic Women at First Booking: Effect of Altitude of Residence in Peru

Table 1

Concentration of maternal hemoglobin (Hb) at first and second booking, gestational age (GA) at first and second hemoglobin measurement, gestational age at delivery and birthweight in populations at low, and moderate and high altitude in Peru.

Altitude	1st Hb (g/dL)		2nd Hb (g/dL)		GA 1st Hb (weeks)		GA 2nd Hb (weeks)		Gestational age (weeks)		Birthweight (g)
	X ± SD		X ± SD		X ± SD		X ± SD		X ± SD		X ± SD
Low	12.1	0.80	11.4	1.34	17.2	8.2	36	11.6	38.9	1.76	3262	512
Moderate	12.7	0.90	12.5	1.43	19.4	8.36	36.7	4.6	38.8	2.07	3123	529
High	13.0	0.88	12.9	1.40	20.6	8.3	37.3	3.9	38.8	1.89	3095	489
𝑃	<0.05		<0.05		<0.05		<0.05				<0.05
Total	12.4	0.91	11.9	1.52	18.3	8.4	36	4.5	38.9	1.83	3206	515

g/dL = grams per deciliter; 𝑃= Probability. One-way ANOVA. 𝑃<0.05 for each column except gestational age (𝑃>0.05).