Table 3 Results of Cox proportional hazards model of the factors associated with quitting job during the first year.
| Variables* | β | p value | HR (95% CI) |
|---|---|---|---|
| Age (1 year) | 0.09 | 0.005 | 1.09 (1.03 to 1.15) |
| WR‐LRTS | |||
| No | |||
| Yes | 0.71 | 0.047 | 2.03 (1.01 to 4.07) |
| Cross shift ΔFEV1 | |||
| Non‐decliners | |||
| Decliners | −0.70 | 0.062 | 0.50 (0.24 to 1.05) |
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.