Saltz 1987.

Methods	Controlled before and after study, unit of allocation = bar.
Participants	Navy sites, USA Experimental = one bar Control =one bar
Interventions	Server training Development of new and revised management policies regarding the service of alcohol and an 18‐hour training course for all club personnel (five weekly sessions of 3‐4 hours each). The training curriculum was designed to embody the principles of server intervention and blend them with the new policies that employees were going to follow. Training conducted during August and beginning of September 1985. Control received no intervention.
Outcomes	Behaviour of patrons (self‐reported alcohol consumption), by interview.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Adequate sequence generation?	High risk	Two US Navy clubs were selected, one control and one experimental.
Allocation concealment?	Unclear risk	No information.
Blinding? All outcomes	Unclear risk	Not reported.
Confounders	Unclear risk	The control was selected for its operation similarity and geographical proximity to the experimental club.
Data collection methods	Unclear risk	Random patron interviews were used to gather outcome data.
Withdrawals & dropouts	Unclear risk	N/A
Intervention integrity	Unclear risk	Not reported.
Duration of follow‐up	Unclear risk	Patrons were selected randomly; response rates 90% in experimental premises for both pre and post test and 90% and 87% in control respectively. Pre and post intervention periods were 4‐6 weeks in length.