Exposure indices and their categorisation among laboratory animal workers: categories of the product of intensity and duration of exposure to rats
| Category | Characteristics | Mean | 95% CI |
|---|---|---|---|
| Letters in parentheses indicate the site. | |||
| GM, geometric mean. | |||
| 1 – Low | Not working with rats | 0.0 | 0.0 to 0.0 |
| 2 | Not working with conscious rats | 11.5 | 10.0 to 12.9 |
| Working with conscious rats | |||
| 3 | 0–≤150 hours per week.μg/m3 | 59.6 | 47.5 to 71.7 |
| 4 | >150–<900 hours per week.μg/m3 | 450.3 | 383.0 to 517.7 |
| 5 – High | ≥900 hours per week.μg/m3 | 1117.3 | 1071.7 to 1162.9 |