Trimester‐specific rate of gestational weight loss or gain and birth size: differences by prepregnancy BMI
Authors' conclusion
Among people with prepregnancy obesity class II or III, GWG rate is associated with higher LGA risk in a dose-dependent manner, including understudied ranges of weight loss, but with weak associations with SGA.
Study context
- Population
- Pregnancies in a national network of community health care organizations
- Participants
- 20,676 / 19,156 / 11,647 / 5,124 / 3,197
- Exposure
- Trimester-specific gestational weight gain (GWG) rate across prepregnancy BMI categories
- Normal weightn = 20,676
- Overweightn = 19,156
- Obesity class In = 11,647
- Obesity class IIn = 5,124
- Obesity class IIIn = 3,197
- Outcome
- SGA and LGA (vs AGA) by trimester 1, 2 or 3 GWG rate
Methodological detailsstratified by prepregnancy BMI, modified Poisson regression
- Stratified by prepregnancy BMI
- Modified Poisson regression
Main finding
As reported in the abstract
GWG-LGA associations strongest in trimester 1; RR range for 10th vs 50th percentile GWG, across BMI categories
0.60-0.73
GWG-SGA associations strongest in lower BMI categories and in trimester 2; RR, Normal weight
1.62
GWG-SGA RR, trimester 2, Obesity class I
1.40
GWG-SGA RR, trimester 2, Obesity class III
1.17
Observational data: associations, not effects.
Original publication
Trimester‐specific rate of gestational weight loss or gain and birth size: differences by prepregnancy BMI. Obesity (Silver Spring). Published 30 July 2024. doi:10.
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