Variables | All, n (%)* | Work-related asthma symptoms, n (%)* | Work-exacerbated asthma, n (%)* | Occupational asthma, n (%)* |
n (%) | 3650 | 132 (3.3) | 41 (1.1) | 33 (0.8) |
Age in years (mean, SD) | 45.3 (3.4) | 44.3 (9.4) | 43.5 (11.3) | 46.3 (9.3) |
First quartile (mean 31.0 years) | 891 (17.8) | 30 (4.2) | 11 (1.3) | 5 (0.5) |
Second quartile (mean 40.6 years) | 891 (21.3) | 30 (2.4) | 13 (1.1) | 9 (0.3) |
Third quartile (mean 48.5 years) | 892 (27.6) | 39 (3.5) | 11 (0.8) | 10 (1.2) |
Fourth quartile (mean 61.1 years) | 890 (31.0) | 28 (2.6) | 6 (1.3) | 9 (0.8) |
Sex | ||||
Male | 1153 (22.3) | 31 (1.8) | 9 (0.3) | 3 (0.1) |
Female | 2437 (76.1) | 99 (3.6) | 32 (1.3) | 30 (1.0) |
Ethnicity | ||||
Non-Hispanic white | 2544 (71.1) | 80 (2.8) | 33 (1.4) | 20 (0.7) |
Non-Hispanic blacks | 218 (6.2) | 14 (5.8) | 2 (1.3) | 3 (0.2) |
Hispanic | 519 (12.1) | 26 (4.7) | 6 (0.2) | 8 (1.5) |
Other | 316 (9.1) | 10 (2.3) | 0 | 2 (0.9) |
Atopy | ||||
No | 2906 (80.4) | 99 (2.8) | 20 (0.6) | 23 (0.6) |
Yes | 576 (14.7) | 32 (6.4) | 19 (3.3) | 8 (1.3) |
Smoking status | ||||
Non-smoker | 2387 (65.1) | 71 (2.6) | 26 (1.2) | 27 (0.9) |
Current smoker | 329 (9.1) | 24 (5.3) | 7 (0.3) | 1 (0.1) |
Ex-smoker | 884 (24.3) | 34 (4.0) | 8 (1.1) | 5 (0.7) |
Body mass index | ||||
Normal (<25.0) | 1608 (43.6) | 33 (1.9) | 9 (0.4) | 9 (0.5) |
Overweight (25.0–29.9) | 1202 (31.3) | 47 (2.9) | 18 (2.0) | 10 (0.6) |
Obese (30 and above) | 743 (22.3) | 48 (5.8) | 14 (1.3) | 14 (1.6) |
Health care professionals | ||||
Physicians | 862 (19.2) | 7 (0.8) | 6 (0.7) | 2 (0.2) |
Occupational therapists | 968 (3.1) | 25 (2.6) | 10 (1.0) | 12 (1.2) |
Nurses | 941 (73.4) | 35 (3.7) | 11 (1.2) | 8 (0.9) |
Respiratory therapists | 879 (4.4) | 65 (7.4) | 14 (1.6) | 11 (1.3) |
↵* Weighted %, unweighted n.
Missing values in the variables were treated as a separate category during the analysis, instead of deleting them from the analysis.