Robertson 1987.

Methods	Quasi‐RCT
Participants	Inclusion criteria: breech presentation suitable for ECV at term (37 to 41 weeks). N = 58. Exclusion criteria: oligohydramnios, estimated fetal weight < 2500 g or > 4000 g, non‐reactive NST.
Interventions	Intervention:tocolytic: ritodrine ‐ beta stimulant (A1) ‐ parenteral. Use of tocolysis (ritodrine infusion 200 micrograms per minute for 20 minutes) compared with no tocolysis. All women had IV lines. Repeat version attempt with tocolysis was successful in 1/9, with initial failure in the control group (for immediate success rate, this review considered only the initial attempt). N = 30. Comparison:no tocolytic. N = 28.
Outcomes	Non‐cephalic presentation at birth; CS; immediate ECV success.
Notes	Tacoma, Washington, USA. July 1984 to May 1987.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	High risk	Allocated according to last digit of social security number.
Allocation concealment (selection bias)	High risk	Allocated according to last digit of social security number.
Blinding of participants and personnel (performance bias) All outcomes	High risk	No blinding.
Blinding of outcome assessment (detection bias) All outcomes	High risk	No blinding.
Incomplete outcome data (attrition bias) All outcomes	Low risk	3 women lost to follow‐up in the intervention group and 5 in the control group. This seems unlikely to impact outcomes.
Selective reporting (reporting bias)	Unclear risk	We did not assess the trial protocol.
Other bias	Low risk	Groups were similar in age, parity, maternal weight, GA, EFW. No other biases apparent.