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Description of the study population.
| All apprentices (n = 300) | Exposure volunteers (n = 28) | |
| Gender | ||
| Female | 293 (97,7) | 27 (96,4) |
| Male | 7 (2,3) | 1 (3,6) |
| Training level | ||
| First year | 73 (24.3) | 4 (14,3) |
| Second year | 141 (47.0) | 17 (60,7) |
| Third year | 86 (28.7) | 7 (25.0) |
