Table 1.
Prevalence of drug use reported by students who completed only the test or only the retest and by students who completed both questionnaires
| Drugs examined by the ESPAD‐Italia® 2004 questionnaire | Students present at the time of the first questionnaire (test) | Students present at the time of the second questionnaire (retest) | Students present at the time of both questionnaires | chi2 | Prob > chi2 |
|---|---|---|---|---|---|
| P × 100 | P × 100 | P × 100 | |||
| Tobacco | 73.3 | 73.8 | 67.5 | 4.86 | 0.08 |
| Alcohol | 93.3 | 88.2 | 90.9 | 5.04 | 0.08 |
| Drunkenness | 67.9 | 68.2 | 56.8 | 15.05 | 0.001 |
| Cannabis | 47.3 | 52.5 | 35.3 | 25.48 | 0.000 |
| Other illicit drugs | 19.7 | 24.3 | 12.4 | 19.50 | 0.000 |