TABLE 4.
Difference (95% confidence interval) in Percent Predicted Pulmonary Function Test Results (post-shift–pre-shift) for a Doubling in Exposure to Dust, Bioaerosols, or Ozone *, +
| Outcome | Dust | Endotoxin | b-glucan | Ozone |
|---|---|---|---|---|
|
| ||||
| FVC (% points) | 0.15 (−0.33, 0.64) | 0.08 (− 0.24, 0.39) | 0.03 (− 0.48, 0.54) | 0.44 (− 2.27, 3.15) |
| FEV1 (% points) | 0.22 (− 0.36, 0.81) | 0.10 (− 0.49, 0.28) | 0.04 (− 0.57, 0.65) | 0.80 (− 2.43, 4.04) |
| FEV/FVC (% points) | 0.22 (− 0.18, 0.61) | 0.06 (− 0.32, 0.20) | 0.13 (− 0.28, 0.54) | 0.04 (− 2.15, 2.23) |
| FEF25–75 (% points) | 0.33 (− 1.32, 1.99) | 0.40 (− 1.49, 0.69) | 0.21 (− 1.52, 1.95) | 4.43 (− 4.76, 13.62) |
| PEFR (% points) | 2.24 (0.18, 4.30) | 1.03 (−0.31, 2.36) | 1.21 (− 1.00, 3.42) | 4.86 (− 6.80, 16.53) |
Boldface indicates statistical significance.
FEV1, forced expiratory volume in the first second; FEF25–75, forced expiratory flow at 25–75%, FVC, forced vital capacity; PEFR, peak expiratory flow rate.
*
Exposures were log transformed and analyzed as continuous variables.
+
Linear mixed effect models were adjusted for smoking (binary: current vs nonsmoker); primary work environment (binary: indoor vs outdoor) and whether measurements were collected on nonwork days (binary: day off vs work day).