Table 4—

Logistic regression analyses with fast/slow tertile of decline in transfer coefficient of the lung for carbon monoxide (KCO) as the dependent variable#

Stepwise logistic regressionAdjusted logistic regression
OR (95% CI)p-value+OR (95% CI)p-value+
FEV1 % pred0.964 (0.938–0.991)0.0090.964 (0.938–0.991)0.009
Female sex0.910 (0.269–3.075)0.879
Age yrs0.977 (0.916–1.043)0.490
Smoking pack-yrs0.999 (0.967–1.033)0.965
  • Odds ratios (ORs) relate to the odds of being in the fast tertile. CI: confidence interval; FEV1: forced expiratory volume in 1 s; % pred: % predicted. #: all of the variables listed in table 3 were available for inclusion in the stepwise model, and the variables listed were forced into the adjusted model; : for sex, age and smoking; +: significant values are shown in bold type.