| Intervention n = 83 | Control n = 209 | p Value | |
| Age in years (SD) | 42.8 (8.8) | 51.4 (5.7) | <0.001 |
| n (%) | n (%) | ||
| Sex (male) | 73* (99%) | 202 (97%) | 0.69 |
| Job position | |||
| Carpenter | 36 (43%) | 75 (37%) | |
| Bricklayer, bricklayer’s assistant | 6 (7%) | 31 (15%) | |
| Manager, staff member, director | 2 (2%) | 12 (6%) | |
| Work foreman | 4 (5%) | 11 (5%) | |
| Office worker | 2 (2%) | 11 (5%) | |
| Driver, crane operator | 1 (1%) | 20 (10%) | |
| Painter | 0 (0%) | 9 (4%) | |
| Tiler, paver | 4 (5%) | 6 (3%) | |
| Scaffolder | 21 (25%) | 0 (0%) | |
| Other | 7 (8%) | 27 (14%) |
*Data missing for nine employees.