| Study | Reason for exclusion |
|---|---|
| Andersson 1988 | Review article |
| Audebert 1985 | The intervention in this study was a different calcium channel blocker, ineligible for this review |
| Occhiuto 2009 | In vitro study of myometrial extracts |
| Sandahl 1979 | Not a randomised controlled trial (nifedipine given as intervention but no control) |
| Ulmsten 1985 | Not a randomised controlled trial (nifedipine given as intervention but no control) |
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