Siedentopf 2013.

Methods	Randomised controlled trial
Participants	Women with diagnosed breast cancer in the immediate postoperative phase Recruited from a hospital breast centre Mean age 57.0 years N = 93
Interventions	• Gitananda yoga and viniyoga (yoga postures, breathing techniques, relaxation techniques), 5 weeks, twice weekly for 75 minutes • Wait‐list, usual care for 5 weeks
Outcomes	Health‐related quality of life (European Organisation of Research and Treatment of Cancer QLQ‐30 and QLQ‐BR23) at week 5 and week 17
Notes	Study authors were contacted for unpublished data, but no such data were used.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Lottery randomisation process
Allocation concealment (selection bias)	Low risk	"sealed envelopes"
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	No information on blinding
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	No information on blinding
Incomplete outcome data (attrition bias) All outcomes	High risk	Missing outcome data balanced in numbers across groups with high dropout (16 in IG, 16 in WG, total of 32.3%); no intention‐to‐treat analysis
Selective reporting (reporting bias)	Low risk	No protocol available but no hint of selective reporting
Other bias	Low risk	No hint of other bias