Demographic data for British foundry workers with and without work-related respiratory symptoms (WRRS)
| WRRS (n = 69) | No WRRS (n = 282) | |
| Age, years (SD) | 41.1 (12.3) | 42.7 (12.5) |
| Length of employment, years (SD) | 15.4 (12.3) | 14.7 (12.8) |
| Current smoker, n (%) | 25 (36) | 71 (25) |
| Ever smoker, n (%) | 48 (70) | 154 (55)* |
| Self-reported current asthma, n (%) | 8 (12) | 13 (5) |
| FEV1/FVC <0.7, n (%) | 3 (4) | 31 (11) |
| Mean% predicted FEV1 (SD) | 98.3 (10.5) | 98.4 (14.1) |
| Mean% predicted FVC (SD) | 103.1 (9.8) | 103.6 (12.8) |
| Mean% predicted PEF (SD) | 106.2 (17.1) | 108.3 (18.2) |
| Mean FENO, ppb (SD) | 31.1 (24.2) | 29.9 (29.0) |
| Mean EQ-5D VAS (SD) | 76.6 (15.8) | 83.5 (11.0)** |
↵*p = < 0.05, **p = 0.001.