Table 2.
Gestational weight gain (GWG) outcomes in intervention compared to control group across pre-pregnancy body mass index (pBMI) categories (intention-to-treat sensitivity analysis).
| Intervention (n = 119) 1 % Participants |
Control (n = 122) 1 % Participants |
Intervention Effect | Interaction p |
||
|---|---|---|---|---|---|
| OR 2 (95% CI) 3 |
Mean Difference (95% CI) 3 | ||||
| Within IOM guidelines for GWG/week |
|||||
| Normal Weight 4 | 49.2% | 34.4% | 1.92 (0.93, 4.00) | . | |
| Overweight 4 | 10.3% | 3.1% | 1.38 (0.23, 8.27) | 0.739 | |
| Obese 4 | 5.9% | 15.8% | 0.26 (0.02, 2.74) | 0.110 | |
| GWG per week (kg/week) 5 | Mean (SD) | Mean (SD) | |||
| Normal Weight 4 IOM recommendation (0.42 kg/week) |
n = 58 0.48 (0.15) |
n = 61 0.49 (0.16) |
−0.03 (−0.08, 0.02) | . | |
| Overweight 4 IOM recommendation (0.28 kg/week) |
n = 30 0.48 (0.13) |
n = 32 0.53 (0.15) |
−0.01 (−0.07, 0.07) | 0.962 | |
| Obese 4 IOM recommendation (0.22 kg/week) |
n = 17 0.45 (0.16) |
n = 19 0.38 (0.22) |
−0.22 (−2.25, 1.81) | 0.813 | |
| Total GWG (kg) | |||||
| Normal Weight 4 IOM recommendation (11.5–16.0 kg) |
n = 58 11.02 (3.40) |
n = 61 11.43 (3.67) |
−0.69 (−1.94, 0.55) | . | |
| Overweight 4 IOM recommendation (7.0–11.5 kg) |
n = 30 11.30 (3.11) |
n = 32 12.22 (3.69) |
−0.33 (−2.02, 1.36) | 0.764 | |
| Obese 4 IOM recommendation (5.0–9.0 kg) |
n = 17 10.02 (3.67) |
n = 19 8.92 (5.34) |
−0.40 (−3.60, 4.41) | 0.539 | |
1 14 values missing from intervention; 10 missing from control. 2 OR = odds ratio. 3 CI = confidence interval. 4 Underweight to normal weight (≤24.9), overweight (25.0–29.9), obese (≥30.0–39.9). Underweight and normal weight were grouped together due to a low number of observations in the underweight category (n = 4). 5 Calculated over the second and third trimesters of pregnancy. All analyses adjusted for study site (Hamilton, London) but not PBMI as the analysis was for prevention effect across pBMI categories.