Table 4.
Summary of effect sizes indexing comparative effectiveness of two prenatal care models on excessive gestational weight gain, by pre-pregnancy body mass index (BMI) category
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| Pre-pregnancy BMI Category | ||||||||
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| All | Healthy | Overweight | Obese | |||||
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| CP | TC | CP | TC | CP | TC | CP | TC | |
| Predicted probability | ||||||||
| Predicted probability that mother will gain excessive weight during pregnancy. | .26 | .48 | .14 | .31 | .33 | .61 | .38 | .60 |
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| Risk ratio | ||||||||
| CP reduced the risk of excessive weight gain during pregnancy to ____% of what it would have been in the traditional model of prenatal care. | 54 | 45 | 54 | 63 | ||||
| Absolute risk difference | ||||||||
| CP reduced the risk of excessive weight gain during pregnancy by ____ percentage points compared to the traditional model of prenatal care. | 22 | 17 | 28 | 22 | ||||
| Number needed to treat | ||||||||
| You would need to provide ___ women with CP prenatal care (rather than traditional prenatal care) in order to prevent one case of excessive weight gain during pregnancy. | 5 | 6 | 4 | 5 | ||||
CP = Centering Pregnancy (group) prenatal care; TC = traditional care (individual).