| How many years have you worked at your current job? | NP | – | ⩽4 years | 1.5 |
| Gender | If male | 1.0 | NP | – |
| Have you had wheezing in your chest at any time in the last 12 months? | If yes | 1.5 | NP | – |
| Are you allergic to pets, house dust, or pollen? | NP | – | If yes | 1.0 |
| While working at your current job, do you have any allergic symptoms? (runny nose/sneezing, or shortness of breath (asthma), or itchy or tearing eyes, or itchy or red skin) | If yes | 2.5 | If yes | 1.5 |
| Did you have any allergic symptom last year associated with working with animals? | If yes | 1.5 | NP | – |
| How many hours/week are you working with rats | >20 h/week | 2.0 | ⩾12 h/week | 1.5 |
| Maximal total score | | 8.5 | | 5.5 |