Table 4.
Predicted (based on age, gender, and height) and calculated FEV1 and PEF (based on measurements, reported as % predicted) over study subjects
| Parameter | N | Mean | SD | Min | Max |
|---|---|---|---|---|---|
| Knudson predicted values | |||||
| FEV1 (L) | 20 participants | 2.69 | 0.61 | 1.66 | 3.91 |
| PEF (L/s) | 20 participants | 5.93 | 1.06 | 4.11 | 8.10 |
| Study measures, reported as percent of predicted | |||||
| FEV1 (% predicted), AM | 62 subject-days | 95 | 18 | 49 | 124 |
| FEV1 (% predicted), PM | 61 subject-days | 96 | 19 | 48 | 127 |
| PEF (% predicted), AM | 62 subject-days | 89 | 23 | 38 | 133 |
| PEF (% predicted), PM | 61 subject-days | 95 | 23 | 37 | 133 |
| PEF lability (%), (PEFam − PEFpm)/PEFam | 30 subject-days (AM and PM; excl. 1 outlier) | −2.8 | 17.1 | −40.5 | 35.9 |
Abbreviations: FEV1: forced expiratory volume in 1 s; PEF: peak expiratory flow; PM: particulate matter.