| General information | Study groups | Control group | t/x2 | P | |
| gender | man | 13 | 15 | 0.343 | >0.05 |
| woman | 11 | 9 | |||
| Average age | 56.21 ± 6.54 | 56.18 ± 6.61 | 0.016 | >0.05 | |
| Mean course of illness | 8.21 ± 1.25 | 8.28 ± 1.27 | 0.192 | >0.05 | |
| Contact strain | Toluene diisocyanates | 10 | 9 | 0.105 | >0.05 |
| Polyamines | 9 | 10 | |||
| Phthalic anhydride | 5 | 5 | |||