Table 1.
Characteristics of the study patients, knowledge of their smoking habits, and use of spirometry in the study groups, years 1997 and 2002
| Group | 1997 | 2002 | p | |
|---|---|---|---|---|
| N | COPD | 100 | 216 | NA1 |
| Others | 972 | 1429 | NA | |
| All | 1072 | 1645 | NA | |
| Mean age (years ± SD) | COPD | 70.1 (11.3) | 68.3 (13.0) | 0.22 |
| Others | 51.7 (19.8) | 53.4 (19.3) | 0.03 | |
| All | 53.4 | 55.4 | 0.96 | |
| Gender/male N (%) |
COPD | 69 (69.0) | 146 (67.6) | 0.46 |
| Others | 342 (35.2) | 463 (32.4) | 0.09 | |
| All | 411 (38.3) | 609 (37.0) | 0.49 | |
| PEF | COPD | 173.0 (260.3) | 309.3 (148.4) | 0.001 |
| Others | 263.3 (227.1) | 414.8 (121.0) | < 0.001 | |
| All | 247.1 (235.0) | 390.8 (135.0) | < 0.001 | |
| FEV1/FVC | COPD | 61.9 (10.6) | 67.4 (14.0) | 0.04 |
| Others | 81.8 (6.4) | 86.1 (18.1) | 0.10 | |
| All | 74.2 (12.7) | 81.1 (19.0) | 0.001 | |
| Data on smoking status available N (%) | COPD | 45 (45.0) | 182 (84.3) | < 0.001 |
| Others | 133 (13.7) | 693 (48.5) | < 0.001 | |
| All | 178 (16.6) | 875 (53.2) | < 0.001 | |
| Pack years of smoking | COPD | 31.0 (9.8) | 46.9 (17.9) | 0.03 |
| Others | 25.9 (9.3) | 24.5 (18.8) | 0.86 | |
| All | 27.2 (11.5) | 37.3 (19.2) | 0.03 | |
| Spirometry performed N (%) | COPD | 32 (32.0) | 172 (79.6) | < 0.001 |
| Others | 54 (5.6) | 468 (32.8) | < 0.001 | |
| All | 86 (8.0) | 640 (38.9) | < 0.001 | |
1 Not available