Table 2 Institute of Medicine (IOM) [2] recommended weight gain ranges for body mass index (BMI) categoriesf and participant reported ranges
|  |  | Pre-implementation cohort (n = 569) | Post-implementation cohort (n = 270) | ||
|---|---|---|---|---|---|
Pre-pregnancy BMI category | IOM recommended GWG | GWG range matched recommended n (%) | Lowest and highest reported GWG | GWG range matched recommended n (%) | Lowest and highest reported GWG |
Underweighta | 12.5–18.0 | 11 (33) | 7–18 | 3 (18) | 11–20 |
Normal weightb | 11.5–16.0 | 145 (42) | 0–22 | 90 (55) | 6–20 |
Pre-obesec | 7.0–11.5 | 21 (17) | 2–25 | 33 (57) | 6–18 |
Obesed | 5.0–9.0 | 15 (23) | 0–16 | 17 (46) | 5–15 |
All women | N/A | 34% | N/A | 53% | N/A |