Obesity Clinical Trial
Official title:
Effects of Dietary and Lifestyle Interventions in Obese Pregnant Women From the First Trimester on Gestational Weight Gain and Pregnancy Outcomes
Background: Maternal obesity is associated with higher risks of adverse maternal and fetal
complications, but the effects of dietary and lifestyle interventions on gestational weight
gain(GWG) and pregnancy outcomes in obese pregnant women are unclear.
Objective: This study examined whether intensive dietary and lifestyle interventions
initiated in the early pregnancy could decrease GWG, and prevent relevant adverse pregnancy
outcomes in Chinese obese pregnant women.
Design:A randomized controlled trial in obese pregnant women was performed at 6-12 weeks of
gestation.The sample size was estimated using GWG reduction as the primary outcome variable.
The investigators pilot study (data not published) showed the gestational weight gain was
12.73±5.97 for obese women. Assuming intervention may result in 25% (3.1825g) reduction in
GWG, the estimated sample size with 90% power and type I error of 0.05 was 114 women in
intervention group and 57 in control group. Adjusting for 15% refusal or loss to follow up
during pregnancy, the total sample size required was 136 women in intervention group and 68
in control group(standard care group). Participants were randomly assigned to the control or
the intervention group. The intervention focused on restricting energy intake combined with
behavioral lifestyle modification through participation in group sessions and individual
counseling. The primary outcomes were gestational weight gain (GWG) and secondary outcomes
were the incidence of gestational diabetes mellitus (GDM), hypertensive disorders during
pregnancy, large-for-gestational-age (LGA) infants, macrosomia and the rate of caesarian
section.
Hypothesis:The intensive dietary and lifestyle intervention performed from the first
trimester in obese women could decrease total GWG,and perhaps improve relevant pregnancy
outcomes.
n/a
Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Single Blind (Subject), Primary Purpose: Prevention
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