Table 2.
Characteristics of patients with COPD by GOLD criteria compared to those with COPD by LLN
| COPD by GOLD, N=270 | COPD by LLN, N=241 | COPD by GOLD, but not COPD by LLN, N=29 | |
|---|---|---|---|
| Age (mean) | 70.08 (SD =12.29) | 69.39 (SD =12.107) | 75.83 (SD =12.57) |
| Sex (males) | 113 (41.9%) | 98 (40.6%) | 15 (51.7%) |
| Race (Caucasian) | 253 (93.7%) | 226 (93.7%) | 27 (93.1%) |
| BMI (mean) | 29.55 (SD =9.87) | 29.05 (SD =9.83) | 33.77 (SD =9.32) |
| Current smokers | 85 (31.5%) | 81 (33.6%) | 5 (17.2%) |
| Former smokers | 137 (50.7%) | 135 (56%) | 9 (31%) |
| Never smokers | 44 (16.3%) | 24 (9.9%) | 13 (44.8%) |
| 1–15 years pack-years | 21 (7.7%) | 19 (7.8%) | 2 (6.8%) |
| 16–30 pack-years | 54 (20%) | 47 (19.5%) | 7 (24%) |
| 31+ pack-years | 118 (43.7%) | 108 (44.8%) | 11 (37.9%) |
Abbreviations: BMI, body mass index; COPD, chronic obstructive pulmonary disease; GOLD, Global Initiative for Chronic Obstructive Lung Disease; LLN, lower limit of normal.