Aims: To address characteristics of drinking establishments, bartenders and patrons that may affect the likelihood of over-serving.Design: A systematic examination of 425 purchase attempts with pseudo-intoxicated patrons enacting scripts that, according to the law, should lead to the denial of alcohol sales.Setting: Drinking establishments in the three largest cities in Norway were visited by male and female actors aged 20-30 years on weekend nights.Measurements: Over-serving was recorded when the pseudo-intoxicated patron was served alcohol. Characteristics of the drinking establishment, the bartender and the pseudointoxicated patron were systematically recorded.Results: Pseudo-intoxicated patrons were served in 347 of 425 purchase attempts (82%). In bi-variate analyses, over-serving rate increased with venue characteristics, music/noise level and intoxication level among patrons. These factors were inter-correlated and correlated with poor lighting. Over-serving rate was also higher when the pseudo-intoxicated patron was female and when the purchase attempt occurred after midnight. In multi-variate analyses, two factors increased the likelihood of over-serving significantly: a high problematic bar indicator score (poor lighting, high music/noise level and high intoxication level among patrons) (adjusted OR=3.5, 95% CI = 1.9 , 6.4) and female gender of pseudo-intoxicated patron (adjusted OR=2.6, 95% CI=1.4 , 4.7). The rate of over-serving was 95% when both risk factors were present and 67 % when both factors were absent.
Conclusions:In the Norwegian intoxication oriented drinking culture, over-serving occurs frequently, even in the absence of risk factors such as poor lighting, loud music and high intoxication level among patrons.