Ossip‐Klein 1984

Methods	Cluster randomised controlled trial with two groups.
Participants	Country: USA. Setting: other. Health problem: addictions (alcohol). Recruitment: health system. Participants: adult male (n=50).
Interventions	Contract features: Form: written; Parties: patients‐carers; Incentives: other; Co‐interventions: no. Experimental group: contract with a significant other or self, agreeing to post a prompt calendar in a prominent place, attend aftercare sessions and telephone at least an hour in advance if unable to attend aftercare. Control group: no contracts or prompt calendars.
Outcomes	Attendance at aftercare sessions.
Notes
Risk of bias
Item	Authors' judgement	Description
Allocation concealment?	Yes	A ‐ Adequate