Associations between indices of asthma and risk factors among woodworkers and non-exposed subjects; OR (95% CI) in logistic regression analyses
| Independent variables, 0 = no = reference | Outcome variables | |||
|---|---|---|---|---|
| Asthma symptoms† (n = 335)* | Work related asthma symptoms‡ (n = 176)* | Asthma symptoms + BHR§ (n = 156)* | Clinical asthma¶ (n = 222)* | |
| *Numbers in the final model. | ||||
| †Asthma symptoms according to the appendix. Reference: no respiratory symptoms. | ||||
| ‡Work related wheezing or work related self reported asthma. Reference: no work related asthma symptoms. | ||||
| §BHR + symptoms. Baseline FEV1 is included in the model. Reference: no asthma symptoms, no BHR. | ||||
| ¶Persons with asthma symptoms and either (1) BHR or (2) BDIR or (3) increased PEF variability or (4) wheezing or chest tightness by exposure to pollen or animals. Reference: no respiratory symptoms, no objective criteria suggestive of asthma. | ||||
| **All models include a “dummy” variable adjusting for the stratified sampling design. | ||||
| Wood dust exposure | 1.45 | 1.08 | 2.16 | 1.34 |
| 1/0 | (0.74–2.84) | (0.45–2.61) | (0.72–6.52) | (0.60–2.99) |
| Smoking 1/0 | 2.98 | 3.57 | 2.27 | 3.23 |
| (1.78–4.93) | (1.69–7.57) | (0.95–5.42) | (1.77–5.90) | |
| Atopy 1/0 | 3.10 | 3.96 | 5.52 | 3.32 |
| (1.87–5.16) | (1.92–8.15) | (2.40–13.16) | (1.81–6.06) | |
| Additional variables included in the final model** | Gender | Gender, sideline occupation, education level | Gender, baseline FEV1 | Gender |