Table 1.
Characteristics of 1003 participants aged 40 years and older for whom results of spirometry were available
| Characteristic | Result of spirometry | ||
|---|---|---|---|
| No COPD n = 795 | GOLD stage 2 COPD*n = 164 | GOLD stage 3 or 4 COPD†n = 44 | |
| Age, yr, mean (SD) | 59.1 (10.5) | 64.0 (9.9) | 68.0 (8.7) |
| Sex, male:female ratio | 418:377 | 80:84 | 23:21 |
| Current smoker, no. (%) | 337 (42.4) | 72 (43.9) | 24 (54.5) |
| FEV1/FVC ratio, mean (SD) | 0.74 (0.07) | 0.59 (0.07) | 0.42 (0.10) |
| FEV1, % predicted, mean (SD) | 89.0 (13.2) | 67.8 (7.7) | 38.1 (7.7) |
| Smoking history, pack-years, mean (SD) | 33.0 (14.0) | 38.3 (16.4) | 46.8 (23.4) |
| Body mass index, mean (SD) | 29.7 (6.4) | 27.9 (5.7) | 25.0 (5.5) |
| White, no. (%) | 791 (99.5) | 163 (99.4) | 43 (97.7) |
| Medical Research Council dyspnea score, median (IQR) | 1 (1–2) | 2 (1–2) | 2 (2–3) |
| Self-reported diagnosis of COPD, no. (%) | 43 (5.6)‡ | 43 (26.7)§ | 24 (54.5) |
| ≥ 1 respiratory symptom, no. (%) | 519 (65.6)** | 121 (74.7)†† | 39 (90.7)‡‡ |
Note: COPD = chronic obstructive pulmonary disease, FEV1 = forced expiratory volume in first second of expiration, FVC = forced vital capacity, IQR = interquartile range, SD = standard deviation.
*
FEV1/FVC < 0.7 and FEV1 ≥ 50% predicted but < 80% predicted.
†
FEV1/FVC < 0.7 and FEV1 < 50% predicted.
‡
Data available for 774.
§
Data available for 161.
**
Data available for 791.
††
Data available for 162.
‡‡
Data available for 43.