FEV1 Predictor Parameter Estimate Standard Error p-value Age at test -0.03842 0.00141 <0.0001 Height at test (in) 0.08397 0.00486 <0.0001 Smoking History (pk-yrs) -0.00314 0.00107 0.0034 Utility Worker Status 0.30053 0.04526 <0.0001

Table 4: Predictors of FEV1 from Linear Regression Analysis.