Table 1.
Patient characteristics
| All | Patients with airflow limitation (%FEV1 < 70%) | Patients without airflow limitation (%FEV1 ≥ 70%) | ||
|---|---|---|---|---|
| Number of patients (%) | 3855 | 608 (15.8%) | 3247 (84.2%) | |
| Age (years) | 65.7 ± 12.0 | 72.3 ± 8.61 | 63.4 ± 12.0* | |
| Gender (%) | Male | 1968 (51.1%) | 462 (76.0%) | 1506 (46.4%)** |
| Female | 1887 (48.9%) | 146 (24.0%) | 1742 (53.6%) | |
| Smoking status (%) | Current smoker | 1571 (40.8%) | 357 (58.7%) | 1214 (37.4%)*** |
| Ex smoker | 221 (5.7%) | 114 (18.8%) | 107 (3.3%)*** | |
| Nonsmoker | 2063 (53.5%) | 137 (22.5%) | 1926 (59.3%) |
*
Notes: = significantly different to the age of the patients with airflow limitation (P < 0.001);
**
significantly different compared to the percentage of males among patients with airflow limitation (P < 0.01);
***
significantly different compared to the percentages of current and past smokers among patients with airflow limitation (P < 0.01).
Abbreviation: %FEV1, ratio of forced expiratory volume in one second to forced vital capacity.