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Summary of baseline characteristics
| Author, Year | Study Size | Country | Mean Age | First pregnancy% | Mean Pre pregnancy BMI (Kg/m2) |
education High school or less% |
Ethnicity Non white% |
Gestational Age at Enrolment (weeks) |
|---|---|---|---|---|---|---|---|---|
| RCTs | ||||||||
| Asbee, 2009[24] | 144 | USA | 26.6 | NR | 25.5 | 67% | 84% | 13.7 |
| Guelinckx, 2010[22] | 195 | Belgium | 29 | 42% | 33.8 | NR | 0% | 9.8 |
| Hui, 2006[26] | 52 | Canada | 26.2 | NR | 24.5 | NR | 63.8% | < 26 |
| Polley, 2002[25] | 120 | USA | 25.5 | 47% | 22.6 | 45% | 39% | 14.5 |
| Wolff, 2008[23] | 66 | Denmark | 28 | NR | 34.7 | NR | 0% | 15.5 |
