Table 3

 Results of Cox proportional hazards model of the factors associated with quitting job during the first year

Variables*βp valueHR (95% CI)
WR-LRTS, work related lower respiratory tract symptoms; Δ, change.
*Factors included in analyses are age, sex, mill, occupational group, past exposure, dust level, endotoxin level, smoking, cross shift ΔFEV1, cross week ΔFEV1, WR-LRTS, and WR-URTS.
Age (1 year)0.090.0051.09 (1.03 to 1.15)
    Yes0.710.0472.03 (1.01 to 4.07)
Cross shift ΔFEV1
    Decliners−0.700.0620.50 (0.24 to 1.05)