Table 2.
Characteristics of patients with coexisting COPD and lung cancer by group
| Variables | COPD unknown (n=48) |
COPD known (n=32) |
P-value |
|---|---|---|---|
| Sex M/F, % | 69/31 | 88/12 | 0.096 |
| Age, mean (SD), years | 68.9 (9.3) | 73.4 (8.8) | 0.034 |
| Emphysema, n (%) | 31 (64.6) | 29 (90.6) | 0.018 |
| GOLD stage, n (%) | 0.102 | ||
| A | 24 (50.0) | 10 (31.2) | |
| B | 14 (29.2) | 10 (31.2) | |
| C | 5 (10.4) | 2 (6.2) | |
| D | 5 (10.4) | 10 (31.2) | |
| FEV1 %, mean (SD) | 70.7 (13.1) | 54.6 (17.3) | 0.044 |
| DLCO%, mean (SD) | 72.4 (21.6) | 58.6 (18.8) | 0.013 |
| Outpatient visits (n), mean (SD) | 30.4 (22.1) | 20.2 (16.1) | 0.029 |
| Histology (adenocarcinoma/squamous), % | 48/39 | 36/48 | 0.569 |
| Lung cancer stage (%) | 0.013 | ||
| Ia | 6.8 | 24.1 | |
| Ib | 6.8 | 24.1 | |
| IIa | 2.3 | 10.3 | |
| IIb | 15.9 | 17.2 | |
| IIIa | 13.6 | 3.4 | |
| IIIb | 25.0 | 6.9 | |
| IV | 27.3 | 13.8 | |
| Mortality (%) | 58.3 | 56.2 | 0.891 |
Abbreviations: DLCO, diffusing capacity of the lungs for carbon monoxide; F, female; FEV1, forced expiratory volume in 1 second; GOLD, Global Initiative for Chronic Obstructive Lung Disease; M, male; SD, standard deviation.