Characteristics of the groups
| Animal workers | Controls | |
|---|---|---|
| Number (n) | 15 | 15 |
| Sex (male/female) | 7/8 | 7/8 |
| Pets at home (n) | 8 | 7 |
| Pets | ||
| Cat (n) | 4 | 7 |
| Dog (n) | 4 | 1 |
| Age of mattress (years: median, range) | 5 (1–20) | 6 (1–20) |
| Mattress size (m2: mean, range) | 2.8 (1.9–4.5) | 2.5 (1.5–3.9) |