Johnsson 2003.

Methods	Randomised controlled trial, unit of allocation = bar.
Participants	Lund University, Sweden Experimental = six student bars Control = six student bars
Interventions	Server training Training programme based on the Alcohol Skills Training Program (ASTP) and the Swedish version of the Responsible Beverage Service. Bartenders in 'key positions' attended educational programme (n=40), these participants were responsible for the total amount of alcohol served in the bar during an evening, responsible for spreading the educational programme to their colleagues, responsible for creating guidelines for serving beverages responsibly. The focus of the programme was on the servers' own reaction to alcohol. Control received no server training.
Outcomes	Patron behaviour (alcohol consumption, determined by breath tests).
Notes	Not professional servers (did not receive monetary payment for service).
Risk of bias
Bias	Authors' judgement	Support for judgement
Adequate sequence generation?	Low risk	Randomisation was stratified for number of members of each bar. Six of 12 student bars at Lund University were allocated by drawing lots to the intervention group, remaining six were used as the control group.
Allocation concealment?	High risk	Inadequate.
Blinding? All outcomes	Low risk	Those conducting the breath tests were not aware of allocation status.
Confounders	Unclear risk	Any differences in baseline between the groups were not reported.
Data collection methods	Unclear risk	Patron intoxication was measured at baseline and one month after intervention, by breath test in invited and consenting patrons. 664 tests were made at baseline, one patron refused. 658 tests were made at follow‐up (360 in experimental, 298 in control), there were no refusals.
Withdrawals & dropouts	Unclear risk	None reported.
Intervention integrity	Unclear risk	Forty staff in 'key positions' from experimental bars were trained.
Duration of follow‐up	Unclear risk	Follow‐up data were collected one month after intervention.