From: Exposure of hairdressing apprentices to airborne hazardous substances
 |  | [6–8 h [(%) | [8–10 h [(%) | [10–12 h] (%) |
---|---|---|---|---|
 | First year (n = 73) | 37 (50.7) | 30 (41.1) | 5 (6.9) |
CAP | Second year (n = 141) | 42 (29.8) | 87 (61.7) | 12 (8.5) |
 | Third year (n = 86) | 23 (26.8) | 53(61.6) | 10 (11.6) |