Associations between indices of asthma and risk factors among woodworkers; OR (95% CI) in logistic regression analyses
| Independent variables | Outcome variables | |||
|---|---|---|---|---|
| Asthma symptoms† (n = 247)* | Work related asthma symptoms‡ (n = 136)* | Asthma symptoms + BHR§ (n = 118)* | Clinical asthma¶ (n = 181)* | |
| *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, 0.80–0.99 mg/m3, | 1.27 | 3.61 | 5.68 | 2.08 |
| ref. <0.80 | (0.52–3.08) | (0.83–15.72 | (0.62–51.64) | (0.68–6.37) |
| Wood dust, 1.0–1.39 mg/m3, | 1.22 | 2.05 | 3.81 | 2.01 |
| ref <0.80 | (0.53–2.82) | (0.47–9.03) | (0.49–33.20) | (0.73–5.53) |
| Wood dust, >1.39 mg/m3, | 2.30 | 6.43 | 18.30 | 3.29 |
| ref <0.80 | (0.95–5.56) | (1.57–26.43) | (1.96–170.77) | (1.09–9.96) |
| Smoking, 1/0, reference = no | 3.25 | 4.13 | 3.81 | 4.01 |
| smoking | (1.75–6.06) | (1.55–11.02) | (1.11–13.07) | (1.87–8.62) |
| Atopy, 1/0, reference = no atopy | 5.01 | 7.24 | 18.71 | 5.24 |
| (2.60–9.67) | (2.59–20.28) | (4.78–73.25) | (2.38–11.53) | |
| Additional variables included in the final model** | Gender, sideline occupation, previous dusty non-woodworking jobs | Gender, age, education level, sideline occupation | Gender, age, sideline occupation, beech, baseline FEV1 | Gender, sideline occupation, previous dusty non-woodworking jobs |