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Table 1 Substances included, cut-off limits and concentration groups used to estimate degree of substance influence

From: Influence of alcohol and other substances of abuse at the time of injury among patients in a Norwegian emergency department

Drugs Cut off 1 point 2 points 4 points 6 points
Alcohol (ethanol) a 0.01 0.05–0.10 0.11–0.15 0.16–0.25 ≥0.26
Illicit drugs      
 Amphetaminesb 4/4.5 70–270 271–554 555–1052 ≥1053
 Cannabis (tetrahydrocannabinol) 0.15 0.6–2.8 2.9–4.7 4.8–9.7 ≥ 9.8
 Cocaine 6 60–243 244–515 516–789 ≥ 790
Medicinal drugs      
 Alprazolam 5 15–46 47–97 98–147 ≥ 148
 Clonazepam 5 9–47 48–98 99–148 ≥ 149
 Codeine 3 90–286 287–603 604–920 ≥ 921
 Diazepam 29 85–313 314–654 655–996 ≥ 997
 Flunitrazepam 0.8 1.6–6 7–12 13–18 ≥ 19
 Methadone 30 123–433 434–896 897–1360 ≥ 1361
 Morphine 3 15–54 55–140 141–284 ≥ 285
 Nitrazepam 7 14–53 54–110 111–166 ≥ 167
 Oxazepam 143 583–1118 1119–2265 2266–3411 ≥ 3412
 Zolpidem 8 46–104 105–212 213–430 ≥ 431
 Zopiclone 10 35–66 67–136 137–206 ≥ 207
  1. a Values given in %. All other values are calculated and rounded off from original micromolar values, and given in ng/ml
  2. b Sum of amphetamine and/or methamphetamine
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