Nor Azlin 2005.

Methods	RCT.
Participants	Inclusion criteria: singleton term breech pregnancy at a tertiary hospital. N = 60. Exclusion criteria: previous CS or other uterine scar, uterine malformation, antepartum haemorrhage, hypertension, diabetes mellitus, IUGR, oligohydramnios, fetal anomalies, early or active labour, contraindications to IV ritodrine, contraindication to vaginal delivery
Interventions	Intervention: tocolytic: ritodrine ‐ beta stimulant (A1) ‐ parenteral. Ritodrine (IV) ‐ 0.4 mg/mL in 5% dextrose infused at 1.5 mL/min. N = 30 (nulliparous 22 and multiparous 8). Comparison:placebo. N = 30 (nulliparous 23 and multiparous 7).
Outcomes	Successful ECV.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Computer random‐number generator.
Allocation concealment (selection bias)	Low risk	Sealed numbered opaque envelopes.
Blinding of participants and personnel (performance bias) All outcomes	Low risk	Obstetricians and women were blinded.
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Obstetricians and women were blinded.
Incomplete outcome data (attrition bias) All outcomes	Low risk	No exclusions or incomplete data.
Selective reporting (reporting bias)	Unclear risk	We did not assess the trial protocol.
Other bias	Unclear risk	More babies in the frank breech position in the ritodrine group.