Demographic data for each group reported as mean and standard error
| Variable | Intervention | Symptomatic control | Asymptomatic control |
|---|---|---|---|
| Age (years) | 48.0 (1.8) | 49.2 (1.8) | 49.4 (2.5) |
| Height (metres) | 1.78 (0.01) | 1.77 (0.01) | 1.80 (0.01) |
| Weight (kg) | 87.4 (2.2) | 89.9 (2.7) | 90.7 (2.1) |
| Overhead work (% of day) | 32.7 (3.5) | 35.5 (4.8) | 31.2 (4.2) |
| Years in trade | 23.7 (2.0) | 24.3 (1.8) | 22.7 (2.8) |