Table 1.
Characteristics of the respondents.
| Variable | Value |
|---|---|
| Gender, no (%) | |
| Female | 1,343 (59.1) |
| Male | 928 (40.9) |
| Age, range, years (mean ± SD) | 16–85 (22.4 ± 5.2) |
| Semester, range (mean ± SD) | 1–22 (3.7 ± 2.5) |
| Field of study#, no (%) | |
| Technical studies and informatics | 216 (9.8) |
| Natural sciences | 431 (19.5) |
| Humanities, social sciences, languages and sport | 597 (27.0) |
| Economy, law and USW | 484 (21.9) |
| Medicine, pharmacy and psychology | 486 (22.0) |
| Health-related risk attitude, range (mean ± SD) | 6–42 (22.3 ± 5.9) |
| Questionnaire version, no (%) | |
| With caffeine tablets | 1,138 (49.8) |
| Without caffeine tablets | 1,146 (50.2) |
USW, Umweltsystemwissenschaften (environmental systems sciences). #The items for the variable field of study were grouped on the basis of two previous studies and modified according to the local affiliation of the different fields to the faculties.