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Predictors of pregnancy and postpartum haemoglobin concentrations in low-income women

Published online by Cambridge University Press:  02 January 2007

Lisa M Bodnar*
Affiliation:
Department of Nutrition, University of North Carolina School of Public Health and School of Medicine, Chapel Hill, NC, USA Carolina Population Center, University of North Carolina, Chapel Hill, NC, USA
Anna Maria Siega-Riz
Affiliation:
Department of Nutrition, University of North Carolina School of Public Health and School of Medicine, Chapel Hill, NC, USA Carolina Population Center, University of North Carolina, Chapel Hill, NC, USA Department of Maternal and Child Health, University of North Carolina School of Public Health, Chapel Hill, NC, USA
Lenore Arab
Affiliation:
Department of Nutrition, University of North Carolina School of Public Health and School of Medicine, Chapel Hill, NC, USA Department of Epidemiology, University of North Carolina School of Public Health, Chapel Hill, NC, USA
Kim Chantala
Affiliation:
Carolina Population Center, University of North Carolina, Chapel Hill, NC, USA
Thad McDonald
Affiliation:
Department of Obstetrics and Gynecology, Wake Medical Center, Raleigh, NC, USA
*
*Corresponding author: Email bodnar@mwri.magee.edu
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Abstract

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Objective:

Pregnancy and postpartum iron status is of great public health importance, yet few studies have examined predictors of haemoglobin (Hb) concentration during this time. We identified predictors of Hb from 24 weeks' gestation until delivery and from 4 to 25 weeks postpartum.

Design:

Blood was drawn as many as four times during care: at the initial visit, at 24–29 weeks' gestation, at delivery and postpartum. A longitudinal, multivariable linear regression model was used to predict Hb concentration.

Setting:

A public health clinic in Raleigh, North Carolina.

Subjects:

n = 520 women who participated in the Iron Supplementation Study.

Results:

Hb concentration at the previous blood draw, short stature, non-Hispanic white ethnicity/race, > 12 years of education and smoking were positive predictors of pregnancy and postpartum Hb concentrations. Iron supplement use was a positive predictor, while inadequate weight gain and severe nausea/vomiting were negative predictors of gestational Hb. A high infant birth weight and postpartum haemorrhage were negative predictors of postpartum Hb. Pre-pregnancy body mass index had a slight positive relationship with gestational Hb, but had a strong negative relationship with postpartum Hb. The longitudinal model also confirmed the typical pattern of gestational Hb concentration. As the number of weeks between the initial visit and the 24- to 29-week visit increased, Hb at 24–29 weeks' gestation decreased. As gestational age increased from 24 weeks until delivery, Hb concentration increased as well.

Conclusions:

The predictors identified here could be used in clinical settings to target high–risk women for intervention.

Type
Research Article
Copyright
Copyright © CAB International 2004

References

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