Table 1.
Descriptive Data of Subjects with and without History of Spirometry or PEF
| Variables | History of Previously Performed Spirometry or PEF (n=479) | No History of Previously Spirometry or PEF (n=626) |
|---|---|---|
| Age, years (mean, SD) | 57.5 (4.35) | 57.0 (4.45) |
| Males | 56.8%, n=272 | 44.9%, n=281 |
| Never smoker | 39.3%, n=188 | 46.0%, n=288 |
| Former smoker | 44.0%, n=211 | 34.8%, n=218 |
| Current smoker | 16.7%, n=80 | 19.2%, n=120 |
| FEV1, percent predicted (SD) | 95.3 (15.3) | 96.6 (13.7) |
| FVC, percent predicted (SD) | 99.7 (13.5) | 99.7 (12.5) |
| CALa | 13.4%, n=63 | 7.6%, n=47 |
| Wheeze | 12.9%, n=62 | 5.1%, n=32 |
| Physician-diagnosed asthma | 17.8%, n=85 | 2.2%, n=14 |
| Physician-diagnosed COPD or emphysema | 4.4%, n=21 | 1.3%, n=8 |
| Dyspnea | 14.6%, n=69 | 8.0%, n=47 |
| Occupational exposure to VGDF | 40.1%, n=193 | 25.2%, n=158 |
Note: aDiagnosis set after spirometry test in the current study.
Abbreviations: SD, standard deviation; AL, airflow limitation; CAL, chronic airflow limitation; VGDF, vapor, gas dust and fumes.