Prevalence of respiratory symptoms in workers
| Study group# | Control group¶ | p-value | |
| Respiratory symptoms (ever) | |||
| Dyspnoea | 12 (34) | 5 (11.1) | 0.102 |
| Cough | 8 (16) | 3 (6.6) | 0.156 |
| Wheeze | 2 (4) | 1 (2.2) | 0.621 |
| Chest pain | 1 (2) | 0 (0) | na |
| Work-related respiratory symptoms | 13 (26) | 6 (13.3) | 0.123 |
Data presented as n (%). na: not applicable. #: n = 50; ¶: n = 45.