Difference in nasal obstruction (after work−before work) measured on a VAS scale, medians (range) for four exposure groups
| Controls n=18 | Low exposure (0.17–0.74 mg/m3) n=30 | Medium exposure (0.74–1.42 mg/m3) n=72 | High exposure (1.42 mg/m3) n=36 | |
|---|---|---|---|---|
| *p<0.05, nasal obstruction after work compared with nasal obstruction before work. Wilcoxon signed rank test for paired data. | ||||
| Nasal obstruction (after work −before work) | −0.18 (−8.40, −9.25) | 0.15 (−4.80, −6.60) | 0.60 (−8.90, 7.75)* | 0.63 (−10.00, −7.70)* |