| Study | Reason for exclusion |
|---|---|
| Foshan 1998 | Randomised trial of ritodrine versus magnesium sulphate for placenta praevia. Outcome data on mean prolongation of pregnancy and mean birthweight only; data presented without standard deviations. |
| Los Angeles 1991 | No clinical outcome measures or details about any other pre‐specified outcome. |
| Tulsa 1984 | Retrospective study comparing two groups of women with diagnoses of placenta praevia. The broad strategies of care differed between the groups but these were determined by the inclinations of the attending physicians and not by any formal experimental design. |
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