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| Group | Estimated GWG | Kappa value | Determined GWG | ||
|---|---|---|---|---|---|
| N (IQR) | RCS | This study | IOM | ||
| Underweight | 395 (18.0–25.0) | 18.5–25.0 | 0.92 | 18.0–25.0 | – |
| Normal weight | 2577 (15.0–24.0) | 14.0–24.0 | 0.91 | 14.0–24.0 | 17.0–25.0 |
| Overweight | 383 (12.5–21.0) | 12.2–24.0 | 0.75 | 12.2–24.0 | 14.0–23.0 |
| Obesity | 81 (13.3–20.0) | 13.3–19.8 | 0.89 | 13.3–20.0 | 11.0–19.0 |
GWG, gestational weight gain; IOM, Institute of Medicine; RCS, restricted cubic spline.
