Table 1

 Characteristics and occupational exposures of study population (n = 1213)

N (%)Biological dust n (%)Mineral dust n (%)Gases/fumes n (%)
IQR, interquartile range.
†p<0.05.
Reference categories are female, age <49 years, and never smokers.
No exposure729 (60.1)814 (67.1)550 (45.3)
    Low367 (30.3)228 (18.8)488 (40.2)
    High117 (9.7)171 (14.1)175 (14.4)
Median (IQR) duration (years)16 (6–30)13 (6–38)15 (5.5–33)
Sex
    Men625 (51.5)226 (36.2)†284 (45.4)374 (59.8)
    Women588 (48.5)258 (43.9)115 (19.6)†289 (49.2)†
Age (years)
    <49213 (17.6)81 (38.0)69 (32.4)122 (57.3)
    50–54274 (22.6)111 (40.5)90 (32.9)142 (51.8)
    55–59231 (19.0)79 (34.2)68 (29.4)124 (53.7)
    60–64206 (17.1)86 (41.8)71 (34.5)106 (51.5)
    ⩾65289 (23.8)127 (43.9)101 (34.9)169 (58.5)
Smoking status
    Never smoker608 (50.1)238 (39.1)169 (27.8)313 (51.5)
    Ex-smoker436 (35.9)181 (41.5)172 (39.5)†258 (59.2)†
    Current smoker169 (13.9)65 (38.5)58 (34.3)92 (54.4)