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Table 3 Primary and secondary gestational weight gain (GWG) outcomes in the ITT sample

From: The effectiveness of an online intervention in preventing excessive gestational weight gain: the e-moms roc randomized controlled trial

  Interventiona n = 1126 Placebo controla n = 563 Adjusted estimateb (95% CI) P-value
Primary outcome - % exceeding the upper limit of guidelines for total GWG
 Intervention effect 48.1% (2.0%) 46.2% (2.4%) 1.09 (0.98, 1.20) 0.12
 Intervention x Strata interaction (3df)     0.19
Secondary outcome - % exceeding the upper limit of weekly GWG rate (kg/week)
 Intervention effect 66.4% (2.0%) 67.9% (2.3%) 1.00 (0.94, 1.07) 0.90
 Intervention x Strata interaction (3df)     0.22
Secondary outcome analysis- total GWG (kg)
 Intervention effect 13.73 (0.46) 13.73 (0.45) 0.10 (−0.58, 0.77) 0.78
 Intervention x Strata interaction (3df)     0.16
  1. aResults are pooled across imputed data sets and are unadjusted for other factors (n = 1689)
  2. bRelative Risk (RR) estimates of excessive total and weekly GWG from log-binomial model for intervention vs placebo adjusted for strata, gestational age at delivery, continuous BMI, and two timing of weight measurement variables. For total GWG, the mean difference (kg) between intervention and placebo from least squares regression model was adjusted for strata, gestational age at delivery, continuous BMI, and two timing of weight measurement variables. The COPY method was used if any of the 60 log-binomial models did not converge [20]