37. Stockwell et al. (A-39) categorized 15 establishments licensed to sell alcohol in metropolitan Perth, Western Australia, as either high risk (seven establishments) or low risk (eight establishments) on the basis of incidence of customers involved in road traffic accidents and drunk-driving offences. Subjects were 414 customers exiting from the chosen establishments between 8 P.M. and midnight on Friday and Saturday nights. They found that high-risk establishments had three times more customers whose breathalyser readings were in excess of 0.15 mg/ml (p < 0.01). They also found that significantly more patrons from high-risk establishments than from low-risk establishments were rated as appearing moderately or severely intoxicated but refused to be breath-tested.