| Characteristics | Respiratory disorders | p-value | ||||||
| Yes (N = 62) n (%) | No (N = 246) n (%) | |||||||
| Age category in years | ||||||||
| 14 - 19 | 4 (16.00%) | 21 (84.00%) | 0.07 | |||||
| 20 - 29 | 29 (29.00%) | 71 (71.00%) | ||||||
| 30 - 39 | 13 (13.27%) | 85 (86.73%) | ||||||
| 40 - 49 | 12 (21.05%) | 45 (78.95%) | ||||||
| 50 - 69 | 4 (14.29%) | 24 (85.71%) | ||||||
| Education | ||||||||
| None | 14 (19.72%) | 57 (80.28%) | 0.05 | |||||
| Primary | 29 (26.85%) | 79 (73.15%) | ||||||
| Secondary 1 | 10 (10.87%) | 82 (89.13%) | ||||||
| Secondary 2 | 7 (28.00%) | 18 (72.00%) | ||||||
| University | 2 (16.67%) | 10 (83.33%) | ||||||
| Number of years in the activity | ||||||||
| <5 | 21 (24.42%) | 65 (75.58%) | 0.15 | |||||
| 5 - 10 | 21 (23.60%) | 68 (76.40%) | ||||||
| >10 | 20 (15.04%) | 113 (84.96%) | ||||||
| Wearing protective equipment | ||||||||
| Yes | 16 (19.51%) | 66(80.49%) | 0.87 | |||||
| No | 46 (20.35%) | 180 (79.65%) | ||||||
| Place of living | ||||||||
| On the work site | 5 (23.81%) | 16 (76.19%) | 0.61 | |||||
| Off the work site, <1 km | 13 (24.07%) | 41 (75.93%) | ||||||
| Off the work site, >1 km | 44 (18.88%) | 189 (81.12%) | ||||||
| Family asthma history | ||||||||
| Yes | 8 (22.86%) | 27 (77.14%) | 0.67 | |||||
| No | 54 (19.78%) | 219 (80.22%) | ||||||
| Cigarette smoking | ||||||||
| Yes | 16 (28.57) | 40 (71.43%) | 0.10 | |||||
| No | 0 (0%) | 9 (100%) | ||||||
| Repairing | ||||||||
| Yes | 35 (20.59%) | 135 (79.41%) | 0.82 | |||||
| No | 27 (19.57%) | 111 (80.43%) | ||||||
| Buying or selling | ||||||||
| Yes | 34 (18.48%) | 150(81.52%) | 0.38 | |||||
| No | 28 (22.58%) | 96 (77.42%) | ||||||
| Dismantling | ||||||||
| Yes | 41(19.52%) | 169 (80.48%) | 0.7 | |||||
| No | 21 (21.43%) | 77 (78.57%) | ||||||
| Collection or discharge | ||||||||
| Yes | 43 (19.03%) | 183 (80.97%) | 0.42 | |||||
| No | 19 (23.17%) | 63 (76.83%) | ||||||