From: Exposure of hairdressing apprentices to airborne hazardous substances
 |  | First year | Second year | Third year | Volunteers |
---|---|---|---|---|---|
 |  | (n = 73)a | (n = 141)a | (n = 86)a | (n = 28)a |
 |  | (max = 68)b | (max = 137)b | (max = 86)b | (max = 26)b |
 |  | (min = 59)c | (min = 131)c | (min = 82)c | (min = 24)c |
Application of permanent waving | 0 per day | 27.9 | 18.2 | 14.5 | 23.1 |
 | [1 – 2] | 45.9 | 38.6 | 49.4 | 46.2 |
 | [3 – 5] | 24.6 | 34.9 | 32.5 | 26.9 |
 | [6 – 15] | 1.6 | 8.3 | 3.6 | 3.8 |
Rinsing permanent waving | 0 per day | 3.2 | 6.7 | 10.6 | 4.0 |
 | [1 – 2] | 62.9 | 38.5 | 47.1 | 52.0 |
 | [3 – 5] | 30.7 | 45.9 | 37.6 | 40.0 |
 | [6 – 15] | 3.2 | 8.9 | 4.7 | 4.0 |
Applying neutralizing agent | 0 per day | 9.8 | 8.3 | 10.5 | 4.2 |
 | [1 – 2] | 63.9 | 39.8 | 46.5 | 54.1 |
 | [3 – 5] | 24.6 | 42.9 | 34.9 | 37.5 |
 | [6 – 15] | 1.7 | 9.0 | 8.1 | 4.2 |
Preparing hair colour | 0 per day | 17.2 | 9.8 | 1.2 | 4.0 |
 | [1 – 4] | 32.8 | 22.5 | 25.9 | 4.0 |
 | [5 – 9] | 35.9 | 37.6 | 40.0 | 64.0 |
 | [10 – 25] | 14.1 | 30.1 | 32.9 | 28.0 |
Applying hair colour | 0 per day | 10.3 | 3.6 | 0 | 3.8 |
 | [1 – 4] | 48.5 | 33.6 | 26.5 | 30.8 |
 | [5 – 9] | 32.4 | 36.5 | 47.0 | 38.5 |
 | [10 – 22] | 8.8 | 26.3 | 26.5 | 26.9 |
Rinsing hair colour | 0 per day | 0 | 1.5 | 1.2 | 0 |
 | [1 – 4] | 32.8 | 18.7 | 20.2 | 15.4 |
 | [5 – 9] | 47.8 | 34.3 | 53.6 | 50.0 |
 | [10 – 25] | 19.4 | 45.5 | 25.0 | 34.6 |
Preparing hair bleaches | 0 per day | 45.9 | 23.9 | 16.9 | 12.0 |
 | [1 – 2] | 22.9 | 34.6 | 40.9 | 44.0 |
 | [3 – 6] | 14.8 | 24.6 | 24.1 | 28.0 |
 | [7 – 20] | 16.4 | 16.9 | 18.1 | 16.0 |
Applying hair bleaches | 0 per day | 64.4 | 34.4 | 23.2 | 32.0 |
 | [1 – 2] | 22.0 | 40.5 | 39.0 | 44.0 |
 | [3 – 6] | 6.8 | 19.8 | 25.6 | 20.0 |
 | [7 – 20] | 6.8 | 5.3 | 12.2 | 4.0 |
Rinsing hair bleaches | 0 per day | 31.7 | 15.3 | 14.3 | 24.0 |
 | [1 – 2] | 30.2 | 43.5 | 42.9 | 48.0 |
 | [3 – 6] | 22.2 | 30.5 | 28.6 | 24.0 |
 | [7 – 20] | 15.9 | 10.7 | 14.3 | 4.0 |