TABLE 1.

Characteristics of the study participants

CharacteristicResulta for:
Factory employees (n = 213)Exposed blood donors (n = 398)Nonexposed blood donors (n = 406)All participants (n = 1,017)
Gender
    Male192 (90.1)b188 (47.2)c226 (55.7)606 (59.6)
    Female21 (9.9)210 (52.8)180 (44.3)411 (40.4)
Age (yr)
    Median4446d4344
    Range20-6218-6919-6818-69
Smoker
    Yes73 (34.3)113 (28.4)64 (15.8)e,f250 (24.6)
        0-10 cigarettes/day20 (27.4)75 (66.4)49 (77.8)144 (57.8)
        >10 cigarettes/day53 (72.6)b38 (33.6)14 (22.2)105 (42.2)
    No140 (65.7)285 (71.6)340 (84.2)765 (75.4)
Chronic lung diseases
    Yes14 (6.6)b10 (2.5)9 (2.2)33 (3.3)
    No199 (93.4)385 (97.5)395 (97.8)979 (96.7)
Airway infections in May 2005
    Yes30 (14.1)b28 (7.2)17 (4.3)75 (7.5)
    No171 (80.3)323 (82.6)344 (86.6)838 (83.7)
    Uncertain12 (5.6)40 (10.2)36 (9.1)88 (8.8)
  • a Data represent the numbers (percentages) of participants, unless otherwise indicated.

  • b Significantly higher (P ≤ 0.015) than for the other two groups.

  • c Significantly lower (P = 0.0168) than for nonexposed blood donors.

  • d Significantly higher (P ≤ 0.031) than for the other two groups.

  • e Significantly lower (P = 0.0001) than for the other two groups.

  • f One smoker did not specify cigarette consumption.