The impact of obesity on outcomes of midwife-led pregnancy and childbirth in a primary care population: a prospective cohort study

Authors

  • DOA Daemers,

    Corresponding author
    1. Faculty of Midwifery Education and Studies Maastricht, Research Centre for Midwifery Science, Zuyd University, Maastricht, the Netherlands
    • Correspondence: DOA Daemers, Faculty of Midwifery Education and Studies (AVM), PO Box 1256, 6201 BG Maastricht, the Netherlands. Email d.daemers@av-m.nl

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  • HAA Wijnen,

    1. Faculty of Midwifery Education and Studies Maastricht, Research Centre for Midwifery Science, Zuyd University, Maastricht, the Netherlands
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  • EBM van Limbeek,

    1. Faculty of Midwifery Education and Studies Maastricht, Research Centre for Midwifery Science, Zuyd University, Maastricht, the Netherlands
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  • LM Budé,

    1. Faculty of Midwifery Education and Studies Maastricht, Research Centre for Midwifery Science, Zuyd University, Maastricht, the Netherlands
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  • MJ Nieuwenhuijze,

    1. Faculty of Midwifery Education and Studies Maastricht, Research Centre for Midwifery Science, Zuyd University, Maastricht, the Netherlands
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  • MEA Spaanderman,

    1. Department of Obstetrics and Gynaecology, University Hospital Maastricht, Maastricht, the Netherlands
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  • RG de Vries

    1. Faculty of Midwifery Education and Studies Maastricht, Research Centre for Midwifery Science, Zuyd University, Maastricht, the Netherlands
    2. Caphri School for Public Health and Primary Care, Maastricht University, Maastricht, the Netherlands
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Abstract

Objective

To assess the impact of obesity on the likelihood of remaining in midwife-led care throughout pregnancy and childbirth.

Design

Secondary analysis of data from a prospective cohort study.

Setting

Dutch midwife-led practices.

Population

A cohort of 1369 women eligible for midwife-led care after their first antenatal visit.

Methods

First-trimester body mass index (BMI) was calculated as weight measured at booking divided by height squared. Obstetric data were retrieved from medical records. Multiple logistic regressions were performed to examine the effects of BMI classification on midwife-led pregnancies and childbirths.

Main outcome measures

Percentages of women remaining in midwife-led care throughout pregnancy and throughout childbirth.

Results

Of women in obesity classes II and III, 55% remained in midwife-led care throughout pregnancy and 30% remained in midwife-led care throughout birth. Compared with women of normal weight, women in obesity classes II and III had fewer midwife-led pregnancies (OR 0.38, 95% CI 0.21–0.69), and women who were overweight or in obesity class I had fewer midwife-led childbirths (OR 0.63, 95% CI 0.44–0.90; OR 0.49, 95% CI 0.29–0.84, respectively). Compared with women of normal weight, women who were obese had higher referral rates for hypertensive disorders (4 versus 14%), prolonged labour (4.6 versus 10.4%), and intrapartum pain relief (4 versus 10.4%). The women who were eligible for midwife-led birth and who were overweight or obese, had no more urgent referrals than women of normal weight. Women who were obese and who completed a midwife-led birth had no more adverse outcomes than women of normal weight, with the exception of higher rates of large for gestational age (LGA) babies (>97.7 centile; 12.1%, versus 1.9% in normal weight and versus 3.3% in overweight women).

Conclusions

Although fewer women who were obese remain in midwife-led care during pregnancy and childbirth, there was no increased risk of unfavourable birth outcomes for women who were obese and eligible for a midwife-led birth when compared with women of normal weight. This indicates that when primary care midwives use a risk assessment tool throughout pregnancy and childbirth they are able to safely assign women who are obese to either midwife-led or obstetrician-led care.

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