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

Table 4

Crude and adjusted models to evaluate the association between the value of the second measurement of maternal hemoglobin (Hb) and preterm births in women with normal hemoglobin levels (11–14.5 g/dL) at first booking in Peru.

Maternal Hb (g/dL)	Sample; 𝑁	Preterm Births (𝑛=4,932)
		𝑛	%	Crude OR	Adjusted OR	CI at 95%
<9	2,575	232	9.01	1.81*	1.73*	1.49	2.00
9–10.9	16,576	1,043	6.29	1.23*	1.28*	1.19	1.38
11–14.5	67,022	3,468	5.17	1.0	1.0
>14.5	3,121	189	6.06	1.18*	1.02	0.87	1.20

*OR 𝑃<0.05. Model adjusted for gestational age at first Hb, maternal age, altitude, maternal education, marital status, body mass index, antenatal care, parity, preeclampsia, gestational diabetes and cardiopathy, and infection of urinary tract (current pregnancy).