Table 2. Associations of Prepregnancy Weight and Cumulative Gestational Weight Gain With Infant Birth Weight.
| Model | Maternal Weight Variable | Infant Birth Weight, g, β (95% CI)a | |
|---|---|---|---|
| Analyses With Observed Data | Analyses With Multiple Imputation Data | ||
| 1 | Prepregnancy weight | 15.2 (8.7-21.7) | 15.6 (11.5-19.8) |
| Gestational weight gain to 14 wk | 13.6 (3.2-24.1) | 13.2 (5.5-20.9) | |
| 2 | Prepregnancy weight | 15.8 (11.0-20.6) | 16.5 (13.4-20.6) |
| Gestational weight gain to 18 wk | 17.4 (9.5-25.4) | 18.5 (11.9-25.2) | |
| 3 | Prepregnancy weight | 14.9 (9.8- 20.1) | 16.3 (12.3-20.4) |
| Gestational weight gain to 23 wk | 18.9 (10.8-27.0) | 18.8 (12.5-25.0) | |
| 4 | Prepregnancy weight | 15.1 (10.3-20.0) | 16.6 (12.6-20.6) |
| Gestational weight gain to 28 wk | 19.6 (12.5-26.7) | 20.7 (14.8-26.7) | |
| 5 | Prepregnancy weight | 18.3 (12.7-23.9) | 16.6 (12.4-20.4) |
| Gestational weight gain to 30 wk | 21.4 (13.3-29.5) | 20.7 (13.2-24.9) | |
| 6 | Prepregnancy weight | 19.5 (13.9-25.2) | 16.4 (12.3-20.3) |
| Gestational weight gain to 32 wk | 19.8 (12.0-27.7) | 19.1 (14.1-25.3) | |
| 7 | Prepregnancy weight | 18.1 (11.6-24.5) | 16.5 (12.5-20.5) |
| Gestational weight gain to 34 wk | 19.7 (11.6-27.8) | 19.1 (13.7-24.5) | |
| 8 | Prepregnancy weight | 14.6 (9.3-19.9) | 16.0 (12.0-20.0) |
| Gestational weight gain to 36 wk | 18.6 (12.0-25.2) | 17.3 (12.2-22.3) | |
| 9 | Prepregnancy weight | 17.1 (12.7-21.5) | 16.2 (12.2-20.2) |
| Gestational weight gain to 38 wk | 16.5 (11.3-21.8) | 17.6 (12.7-22.6) | |
| 10 | Prepregnancy weight | 19.0 (13.2-24.7) | 15.9 (11.9-19.8) |
| Gestational weight gain to 40 wk | 16.7 (9.5-23.9) | 17.1 (12.1-22.1) | |
a
β represents an estimate of linear regression coefficient, representing the change in infant birth weight (grams) when the indicated maternal weight variable changes by 1 kg. None of the 95% CI findings crossed 0, indicating that there is a significant association between the indicated maternal weight variable and infant birth weight. All models are adjusted for prepregnancy weight, cumulative gestational weight gain up to the indicated point in pregnancy, total length of gestation, and infant sex.