Study	Reason for exclusion
Brosset 1956	Method to group allocation is described as "dividing the cases up into two groups". It is highly unlikely that randomisation was used and there is risk of enrolment bias. This study is of historical interest in that it is an early example of a controlled trial.
Dafallah 2004	The methods of randomisation were not described for this study. Participants recruited included women between 36 to 38 weeks' gestation, some of the women were ≥ 37 weeks' gestation; separate data were not reported for women before term.
El‐Muzaini 2008	It was not clear that this was a randomised controlled trial and participants recruited to the study were women with singleton pregnancies with breech presentation at term (≥ 37 weeks).
Kasule 1985	Method to group allocation is described as being dependant on the day that women attended at antenatal clinic (on Monday and Wednesday ECV was performed, whereas on Tuesday and Thursday it was not), and there is significant risk of enrolment bias. It is also unclear in this study how the breech pregnancies were confirmed. In addition, 25% of the study population were grand‐multiparous women who are at increased risk of unstable lie, and are at an increased risk of encountering complications.
Rust 2005	In this trial women were recruited from 36 up to 386/7 weeks. Most included women were at term and separate data were not reported for women less than 37 weeks' gestation.

ECV: external cephalic version