Associations between indices of asthma and risk factors among woodworkers and non-exposed subjects; OR (95% CI) in logistic regression analyses; stratified by atopy and exposure
| 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)* | |
| Variables included in the final models are identical to those stated in table 3. | ||||
| *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. | ||||
| Stratification by atopy | ||||
| Wood dust exposure 1/0, | 2.53 | 1.33 | 3.04 | 2.00 |
| + atopy | (0.97–6.60) | (0.45–4.19) | (0.78–11.85) | (0.70–5.76) |
| Wood dust exposure 1/0, | 0.84 | 0.77 | 1.20 | 0.82 |
| − atopy | (0.33–2.12) | (0.20–2.94) | (0.19–7.45) | (0.25–2.71) |
| Stratification by exposure | ||||
| Atopy 1/0, woodworkers | 4.23 | 4.79 | 7.44 | 4.41 |
| (2.37–7.65) | (2.06–11.11) | (2.80–19.72) | (2.19–8.87) | |
| Atopy 1/0, non-exposed | 0.98 | 1.78 | 2.13 | 1.01 |
| subjects | (0.33–2.89) | (0.40–7.94) | (0.25–17.87) | (0.27–3.84) |