Walker 1997.

Methods	Allocation: randomised (computer algorithm based on 4 randomisation variables). Blindness: double. Duration: 6 months.
Participants	Diagnosis: Primary diagnosis of alcohol abuse or dependence. N=40. Age: mean ˜ 34 years. Sex: 29M, 11F. History: no psychiatric or organic impairment.
Interventions	1. Intercessory prayer: standard care + IP (volunteers with 5 years experience prayed daily for 6 months, prayer was nondirective). N=22. 2. Standard care. N=18.
Outcomes	Leaving the study early. Unable to use ‐ Average monthly SDU (no SD).
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Computer generated.
Allocation concealment (selection bias)	Unclear risk	Unclear.
Blinding (performance bias and detection bias) All outcomes	Unclear risk	Double, untested.
Incomplete outcome data (attrition bias) All outcomes	Low risk	Good reporting of loss to follow up.
Selective reporting (reporting bias)	Unclear risk	Unclear, poor reporting of continuous data.
Other bias	Low risk	No clear other bias.

IP: Intercessory Prayer
 CABG: coronary artery bypass graft
 CCU: Coronary Care Unit.
 PCI: Percutaneous Coronary Intervention
 SDU: Standard Drinking Units