The association between gestational weight gain z-score and stillbirth: a case-control study.
BMC Pregnancy Childbirth
; 19(1): 451, 2019 Nov 29.
Article
in En
| MEDLINE
| ID: mdl-31783735
ABSTRACT
BACKGROUND:
There is limited information on potentially modifiable risk factors for stillbirth, such as gestational weight gain (GWG). Our purpose was to explore the association between GWG and stillbirth using the GWG z-score.METHODS:
We analyzed 479 stillbirths and 1601 live births from the Stillbirth Collaborative Research Network case-control study. Women with triplets or monochorionic twins were excluded from analysis. We evaluated the association between GWG z-score (modeled as a restricted cubic spline with knots at the 5th, 50th, and 95th percentiles) and stillbirth using multivariable logistic regression with generalized estimating equations, adjusting for pre - pregnancy body mass index (BMI) and other confounders. In addition, we conducted analyses stratified by pre - pregnancy BMI category (normal weight, overweight, obese).RESULTS:
Mean GWG was 18.95 (SD 17.6) lb. among mothers of stillbirths and 30.89 (SD 13.3) lb. among mothers of live births; mean GWG z-score was - 0.39 (SD 1.5) among mothers of cases and - 0.17 (SD 0.9) among control mothers. In adjusted analyses, the odds of stillbirth were elevated for women with very low GWG z-scores (e.g., adjusted odds ratio (aOR) and 95% Confidence Interval (CI) for z-score - 1.5 SD versus 0 SD 1.52 (1.30, 1.78); aOR (95% CI) for z-score - 2.5 SD versus 0 SD 2.36 (1.74, 3.20)). Results differed slightly by pre - pregnancy BMI. The odds of stillbirth were slightly elevated among women with overweight BMI and GWG z-scores ≥1 SD (e.g., aOR (95% CI) for z-score of 1.5 SD versus 0 SD 1.84 (0.97, 3.50)).CONCLUSIONS:
GWG z-scores below - 1.5 SD are associated with increased odds of stillbirth.Key words
Full text:
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Database:
MEDLINE
Main subject:
Stillbirth
/
Obesity, Maternal
Type of study:
Clinical_trials
/
Etiology_studies
/
Observational_studies
/
Prognostic_studies
/
Risk_factors_studies
Limits:
Adult
/
Female
/
Humans
/
Pregnancy
Language:
En
Journal:
BMC Pregnancy Childbirth
Journal subject:
OBSTETRICIA
Year:
2019
Type:
Article
Affiliation country:
United States