Latha 1991.

Methods	RCT
Participants	Essential hypertensive patients aged between 45 and 70 years who were attending outpatients at the hypertension clinic at Madras general hospital were recruited. 14 participants were randomised to yoga and thermal biofeedback or to the control group Inclusion criteria: on antihypertensive medication and free from any other abnormalities or pathological conditions 7 patients were randomised to yoga and 7 patients were randomised to the control group The country of publication was India
Interventions	Yoga: participants were told briefly about the nature of training and time of sessions. They practised selected breathing techniques and asanas that were taught by one of the investigators. Participants met twice a week for 6 months Control group: met once a week in the clinical setting to have blood pressure recorded and to have a general talk. They received the same amount of attention as the yoga group Follow‐up was 6 months
Outcomes	Blood pressure
Notes	No contact details provided
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	High risk	Odd and even numbers
Allocation concealment (selection bias)	High risk	Open allocation so trial recruiters knew what the next treatment option was
Blinding of participants and personnel (performance bias) All outcomes	High risk	Not stated but it is difficult, if not impossible, to blind participants and personnel to behavioural interventions such as exercise
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not stated
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	No information provided
Selective reporting (reporting bias)	High risk	No blood pressure measurements are provided for the control group at the end of the intervention period
Other bias	Unclear risk	Insufficient information to judge