| Variables | Skin burning | Itching | Eye irritation |
| % | % | % | |
| Duration of work (year)† |
|
|
|
| <1 | 50 | 30 | 0 |
| 1 - 3 | 25 | 40 | 0 |
| >3 | 25 | 30 | 100 |
| Frequency in urine handling† |
|
|
|
| ≥Twice per week | 75 | 60 | 100 |
| £Twice per week | 25 | 40 | 0 |
| Personal protective equipment |
|
|
|
| Yes | 100 | 90 | 100 |
| No | 0 | 10 | 0 |
| Location of skin symptoms |
|
|
|
| Hand | 37.5 | 25 | 0 |
| Forearm | 37.5 | 50 | 0 |
| Foot | 25 | 0 | 0 |
| Other | 0 | 25 | 100 |