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| Criteria | Rodriguez 2011 | McFadden 2012 | Sohn 2015 | Romano‐Keeler 2016 | NCT02912585 | Glass 2017 |
| Number of participants | 16 | 27 | 12 | 99 | 149 | 30 |
| Gestational age (weeks) | 25‐28 | 27‐32 | 25‐30 | 28‐31 | 26‐31 | 27‐29 |
| Birth weight (grams) | 410‐1250 | 590‐2530 | 490‐1300 | 905‐1602 | 787‐1217 | 1020‐1169 |
