Table 7
Association between possible MFF at first follow up visit in subjects with no welding related respiratory symptoms suggestive of welding related asthma and the presence of the latter at second follow up visit
| Respiratory symptoms at 2nd follow up | Total | ||
|---|---|---|---|
| Yes, n (%) | No, n (%) | ||
| MFF at 1st follow up | |||
| Yes | 4 (22.2) | 14 (77.8) | 18 |
| No | 8 (3.7) | 206 (96.3) | 214 |
| Total | 12 | 220 | 223 |
| OR = 7.4 (95% CI 1.97 to 27.45) | |||
