Table 1 Current working category and exposure level.
| Working category* | |||
|---|---|---|---|
| Toner production | Machine development | Machine maintenance | |
| Example of work | Crushing | Toner supply | Cleaning |
| Mixing | Testing | Toner bottle replacement | |
| Bottling | Dissembling | Repairing | |
| Work environment (mg/m3) | 0.09 (0.04, 0.21) | 0.03 (0.01, 0.09) | 0.03 (0.01, 0.07) |
| Personal exposure (mg/m3) | |||
| Total | 0.5 (0.09, 2.3) | 0.2 (0.05, 2.8) | 1.0 (0.8, 1.8) |
| Respirable | 0.09 (0.03, 0.4) | 0.06 (0.01, 0.7) | 0.2 (0.08, 0.4) |
| Exposure duration (years)† | 7.7 (5.8) | 9.1 (5.7) | 12.3 (5.1) |
| Decade of starting work in toner dust environments†‡ | |||
| 1970s | 6 (4.2) | 2 (1.8) | 21 (6.2) |
| 1980s | 31 (21.8) | 43 (38.1) | 197 (58.3) |
| 1990s | 105 (73.9) | 68 (60.2) | 120 (35.5) |
*The 212 control subjects are excluded from this table.
†Excluding seven subjects with unverified exposure length.
‡Percentage of column total in parentheses.
Values are the median, and the 10th and 90th percentiles for work environment and personal exposure measurements, the arithmetic means and standard deviations for the duration of exposure, and the number of subjects starting work in toner dust environments in the 1970s, 1980s, and 1990s.