Injured motor vehicle drivers who were hospitalized (Umeå: n = 130) and fatally injured drivers who were autopsied (Umeå, Northern Sweden: n = 111; Gothenburg, Western Sweden: n = 136) from May 1991 through December 1993 were tested for alcohol and for both licit and illicit drugs. Nineteen percent of the Umeå-hospitalized drivers (UHDs), 26% of the Umeå fatally injured drivers (UFDs), and 21% of the Gothenburg fatally injured drivers (GFDs) tested positive for drugs and/or alcohol. Ten percent of the UHDs, 8% of the UFDs, and 6% of the GFDs tested positive for drugs. Almost 5% of the UHDs, had illicit drugs, and 6% had licit drugs. Only 3% of the GFDs and none of the UFDs had illicit drugs. Benzodiazepines, followed by opiates, tetrahydrocannabinol, and amphetamine were the most common drugs detected. Twelve percent of the UHDs, 24% of the UFDs, and 17% of the GFDs tested positive for alcohol. Two percent of the UHDs, 6% of the UFDs, and 2% of the GFDs had a combination of drugs and alcohol.
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