Table 4 Sample size estimations evaluating the effect of weight management interventions
Subgroups | Control group SD | Sample size required to detect a 2.5-kg reduction in gestational weight gain | Control group: probability of adverse maternal and fetal outcomes | Sample size required to detect a 30% reduction in adverse maternal and fetal outcomes | |
|---|---|---|---|---|---|
BMI | Obese | 7.5 | 300 | 0.30 | 770 |
Overweight | 7.5 | 300 | 0.20 | 1,290 | |
Normal | 5.1 | 140 | 0.12 | 2,330 | |
Age | <20 years | 7.12 | 270 | ||
≥20 years | 5.87 | 184 | |||
Ethnicity | Caucasian | 3.4 | 64 | ||
Asian | 3.8 | 78 | |||
African | 5.1 | 140 | |||
Parity | <1 | 6.28 | 212 | ||
≥1 | 6.68 | 238 | |||
Risk factors like diabetes | High risk | 6.81 | 248 | ||
Low risk | 6.67 | 236 | |||