Table 1 Study population characteristics according to occupational organic dust exposure status, in numbers (percentages between brackets) (unless stated otherwise)

Number of employers

31

31

Male

31 (100)

31 (100)

Mean age, years (s.e.)^a

43.8 (1.7)

37.1 (1.4)

Seniority, years (s.e.)^a

10.9 (1.5)

7.0 (0.8)

Never

17 (54.8)

13 (41.9)

Ex

10 (32.3)

7 (22.6)

Current

4 (12.9)

11 (35.5)

Asthma (dd)^b

2 (6.5)

2 (6.5)

Allergy (dd)^b

4 (12.9)

1 (3.2)

P3 class mask

-

12 (38.7)

Gloves

-

31 (100)