Exposure indices and their categorisation among laboratory animal workers: categories of hours per week contact with rats
| Category | Characteristics | Mean | 95% CI |
|---|---|---|---|
| Letters in parentheses indicate the site. | |||
| GM, geometric mean. | |||
| 1 – Low | Not working with rats | 0 | 0.0 to 0.0 |
| 2 | Not working with conscious rats | 22.9 | 20.0 to 25.8 |
| Working with conscious rats | |||
| 3 | 0–≤10 hours per week | 2.6 | 2.1 to 3.1 |
| 4 | >10–≤30 hours per week | 23.7 | 21.5 to 25.9 |
| 5 – High | >30 hours per week | 41.3 | 39.6 to 43.0 |