Brockway 1977

Methods	Randomised controlled trial with two groups.
Participants	Country: USA. Setting: speciality. Health problem: addictions (smoking). Recruitment: adverts. Participants: adults (n=27).
Interventions	Contract features: Form: NA; Parties: patients‐practitioners; Incentives: deposit; Co‐interventions: yes. Experimental group: smoking cessation programme including contingency contracting (return of deposit based on attendance at meetings and completion of assignments). Control group: waiting list.
Outcomes	Mean number of cigarettes smoked.
Notes
Risk of bias
Item	Authors' judgement	Description
Allocation concealment?	Unclear	B ‐ Unclear