Table 1.
Distribution of subjects in a Swedish cohort of dry-cleaning and laundry workers
| Category | Males | Females | Total |
|---|---|---|---|
| Original files | 10,389 | ||
| Excluded | 949 | ||
| Exposure ceased before 1973 | 2 | 26 | 28 |
| Exposure commenced after 1983 | 82 | 164 | 246 |
| Duration of employment <1 month | 24 | 76 | 100 |
| Deceased 1973–1984 (before follow-up) | 60 | 119 | 179 |
| Emigrated 1973–1984 (before follow-up) | 30 | 94 | 124 |
| Identity unclear | – | – | 200 |
| Other | 27 | 45 | 72 |
| Included (by exposure category) | 2,810 | 6,630 | 9,440 |
| Dry-cleaning with PERa, % | 1,877 | 4,479 | 6,356 |
| <10 | 940 | 2,466 | 3,406 |
| 10–50 | 412 | 854 | 1,266 |
| >50 | 458 | 1,054 | 1,512 |
| Unclassifiable | 67 | 105 | 172 |
| Laundry | 850 | 2,051 | 2,901 |
| Other dry-cleaning (fluorocarbons, white spirit) | 83 | 100 | 183 |
Subjects excluded or lost to follow-up and by exposure category
aProportion of dry-cleaning with PER in relation to overall annual textile cleaning volume at the company level