eTable 2. A comparison of consumer variables according to type of survey method, n (%) *1.
| Written | Telephone | Online | |
| n = 3154 | n = 2715 | n = 3418 | |
| Alcohol use | |||
| – 30-Day prevalence | 2291 (71.3) | 1974 (69.5)*3 | 2561 (73.8) |
| – Episodic heavy drinking, preceding 30 days*2 | 823 (33.6) | 704 (34.7)*4 | 954 (35.4) |
| Tobacco use | |||
| – 30-Day prevalence | 731 (27.2) | 568 (24.4) | 563 (18.4)*3 |
| – Average number of cigarettes per day, M (SD)*2 | 11.2 (12.2) | 12.7 (9.9) | 10.3 (8.6) |
| Cannabis use | |||
| – Lifetime prevalence | 1139 (35.1) | 656 (21.0)*3 | 1036 (28.0)*3 |
| – 12-Month prevalence | 421 (10.6) | 177 (4.1)*3 | 306 (6.4)*3 |
| Medication use, preceding 12 months | |||
| – Analgesics | 2176 (70.1) | 1852 (69.1) | 2286 (66.8) |
| – Hypnotics | 179 (6.4) | 113 (3.9) | 147 (4.4) |
*1Logistic and linear regression model adjusted according to age, sex, federal state, school education, and net household income (control variables) * 2 In relation to 30-day consumers; * 3 p <0.01 for comparison with “written”; * 4 p <0.05