Bronchial responsiveness in historical controls (HC) and in the study group stratified by exposure to wood dust expressed in terms of the cumulative dust exposure index
↵5-150 HC excluded from the analysis.
↵5-151 HC included in the analysis.
↵5-152 Logistic regression after adjustment for baseline FEV1and age.
↵5-153 Linear regression after adjustment for FEV1 and age.
MBC+=decline in FEV1 by ⩾20%; DRS=1/(% decline in FEV1/μmol +2.5).