Comparison of secondary outcome: proportion within or below BMI-related IOM guideline for weight gain during pregnancy
| Intervention | Usual care | Intervention–usual care | |||
| n/N (%) | n/N (%) | Adjusted % difference (95% CI) | Adjusted OR (95% CI) | P value | |
| Within IOM guideline* | 96/305 (31.5) | 108/311 (34.6) | −2.0 (−14.6 to 10.6) | 0.92 (0.63 to 1.32) | 0.63 |
| Below IOM guideline* | 125/305 (40.9) | 114/311 (36.5) | 4.9 (−7.4 to 17.2) | 1.26 (0.86 to 1.82) | 0.24 |
Analysis adjusted by Site, BMI category and midwife (random effect).
*Includes objective and self-reported weights; missing weights imputed using multiple imputation; pooled estimates.
BMI, body mass index; IOM, Institute of Medicine.