Characteristics of 5866 welders at baseline, Denmark, 1987
| Characteristic | Welders |
| Age (years), mean (SE) | 42.3 (0.16) |
| Never smoked | 1077 (18.4%) |
| Former smoker | 1394 (23.8%) |
| Current smoker | 3376 (57.7%) |
| Number of drinks (glass of beer, wine or spirits) per week | |
| 0–3.5 | 1.374 (23.5%) |
| 4–20.5 | 3.895 (66.7%) |
| ≥21 | 558 (9.7%) |
| Regular use of hypertension or ‘heart’ medicine within past year | 381 (6.5%) |
| Total number of years welding, mean (SE) | |
| Before baseline (1924–1986) | 13.1 (0.13) |
| After baseline (1987–2006) | 5.6 (0.07) |
| Year started welding | |
| <1960 | 1572 (26.8%) |
| 1960–1969 | 2022 (34.5%) |
| 1970–1986 | 2272 (38.7%) |
| Local exhaust used | 2435 (67.5%) |
| Often or sometimes welded in confined space | 2727 (48.1%) |
| Cumulative estimated particulate exposure, mean mg/m3×year (SE) | |
| All years before baseline (1924–1986) | 53.1 (0.71) |
| All years after baseline (1987–2006) | 8.7 (0.18) |