Table 4

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 = referenceOutcome 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 1/0,2.531.333.042.00
+ atopy(0.97–6.60)(0.45–4.19)(0.78–11.85)(0.70–5.76)
Wood dust exposure 1/0,0.840.771.200.82
− atopy(0.33–2.12)(0.20–2.94)(0.19–7.45)(0.25–2.71)
Stratification by exposure
Atopy 1/0, woodworkers4.234.797.444.41
Atopy 1/0, non-exposed0.981.782.131.01