Study	Reason for exclusion
Abu‐Omar 2001	Not random allocation: the 4 treatment protocols were used based on a temporal manner, with each given exclusively over a 3‐month period.
Docherty 1981	Data not presented in a form that was suitable for incorporation in this review. We contacted the authors for additional information.
Dumoulin 1981	This trial was originally included, but has been excluded after advice from the statistician who was part of the editorial team for this review. This study has questionable large discrepancies in sample sizes for the groups of women administered ergometrine‐oxytocin or 5 iu or 10 iu of oxytocin. It is not possible at this stage to determine the correct sample sizes for each group. This review may be included in a future revision if the correct sample sizes can be determined.
Soriano 1996	Not random allocation: the 4 treatment protocols were assigned based on a temporal manner, with each given exclusively over a 10‐week period.
Symes 1984	This study reported a single outcome only (serum prolactin).
Vaughan 1974	Reported for a single outcome only (central venous pressure).