Tab. I.
Pooled drug consumption rates and respective ranges stratified according to the type of study (studies based on questionnaires, urine or saliva samples).
| Drug | Drug consumption | ||
|---|---|---|---|
| Questionnaire | Urine sample | Saliva sample | |
| Amphetamine | 21.3% [95%CI 15.7-28.1] | 3.8% [95%CI 1.7-8.2] | 1.3% [95%CI 0.7-2.4] |
| Benzodiazepines | 1.0% [95%CI 0.1-6.1] | 0.4% [95%CI 0.2-0.6] | NA |
| Cannabis | 5.9% [95%CI 3.5-9.8] | 2.1% [95%CI 1.0-4.3] | 0.5% [95% 0.3-1.0%] |
| Cocaine | 2.2% [95%CI 1.2-4.1] | 1.1% [95%CI 0.7-2.0] | 1.1% [95%CI 0.4-3.1] |
| Opioid | 4.3% [95%CI 0.6-26.4] | 2.0% [95%CI 0.6-6.6] | NA |
| OTC stimulants | 4.1% [95%CI 2.7-6.2] | 9.0% [95%CI 4.3-18.0] | NA |
| Overall drug consumption | 27.6% [95%CI 17.8-40.1] | 6.1% [95%CI 2.9-12.4] | 4.1% [95%CI 1.2-13.1] |
| Poliabuse | 2.7% [95%CI 0.2-25.6] | 0.6% [95%CI 0.1-4.8] | 0.3% [95%CI 0.1-0.7] |
NA: not available; OTC: over-the-counter.