Comet classes | 0 | 1 | 2 | 3 | 4 | Total Comet score | p-value |
Hairdressers (± SD) | 36.3 ± 9.2 | 28.6 ± 6.89 | 19.2 ± 5.41 | 15.65 ± 6.63 | 9.65 ± 2.23 | 161.15 ± 45.84 | <0.0001 |
Control (± SD) | 75.9 ± 17.2 | 7.95 ± 1.79 | 5.35 ± 2.99 | 3.25 ± 1.25 | 1.5 ± 0.83 | 93.6 ± 20.13 |