Prevalence of work related symptoms by refinery and process group
| Work related symptoms (% of subjects) | ||||
|---|---|---|---|---|
| Wheeze | Chest tightness | Shortness of breath | Rhinitis | |
| Refineries: | ||||
| Refinery 1 | 3.2 | 2.5 | 2.8 | 8.0 |
| Refinery 2 | 7.2 | 4.3 | 2.4 | 11.6 |
| Refinery 3 | 3.5 | 2.6 | 2.0 | 7.7 |
| p Value4-150 | <0.001 | 0.06 | 0.63 | 0.008 |
| Process groups: | ||||
| Office or administration | 2.5 | 2.3 | 1.9 | 5.6 |
| Powerhouse | 1.9 | 1.9 | 0.9 | 4.7 |
| Maintenance | 5.4 | 2.8 | 2.1 | 11.7 |
| Digestion | 6.3 | 4.9 | 2.4 | 7.3 |
| Clarification | 5.0 | 4.5 | 3.0 | 10.4 |
| Precipitation | 7.9 | 4.6 | 5.9 | 13.2 |
| Calcification or shipping | 7.5 | 4.3 | 2.2 | 10.2 |
| Residue | 2.6 | 5.1 | 7.7 | 5.1 |
| Descale | 6.1 | 3.7 | 2.4 | 12.2 |
| p Value4-150 | 0.04 | 0.50 | 0.07 | 0.004 |
| All employees | 4.9 | 3.3 | 2.5 | 9.5 |
↵4-150 χ2 Test for difference in proportions.