Obesity and Stillbirth At Term – What is the Actual Risk?
This study by Yao et al. (AJOG, 2014) aimed to explore the relationship between obesity and stillbirth at or close to term.
Retrospective Cohort Study
2,868,482 singleton births were examined. Compared to normal-weight women the hazard ratio for stillbirth was 1.36 for overweight women, 1.71 for class I obese women, 2.00 for class II obese women, 2.48 for class III obese women, and 3.16 for women with a BMI of ≥50. Women with a BMI of ≥50 were at 5.7 times greater risk than normal weight women at 39 weeks’ gestation and 13.6 times greater risk at 41 weeks’ gestation. Obesity was associated with almost a quarter of stillbirths between 37-42 weeks’ gestation. This study, based on a very large dataset, corroborates the association between obesity and stillbirth, particularly in those with a BMI of ≥50.
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