Characteristics | Health blood donors | Train drivers | Short working age | Long working age |
(n, %) | (n, %) | ≤18 yearsa (n, %) | >18 yearsa (n, %) | |
Population number (n, %) | 80 (100) | 82 (100) | 45 (54.88) | 37 (45.12) |
Mean age (SD) | 27 (±8) | 37 (±7) | 32 (±4) | 43 (±4) |