Characteristics

Health blood donors

Train drivers

Short working age

Long working age

(n, %)

(n, %)

≤18 years^a (n, %)

>18 years^a (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)