Characteristics of patients meeting the case definition of COPD and matched comparator subjects
| Patients with COPD (n=112 635) | Comparator subjects (n=112 635) | |
| Age | 68.6 (12.2) | 68.7 (12.2) |
| Male (vs female)*, % | 51.0 | 51.0 |
| SES†‡, % | ||
| Quintile 1 | 25.9 | 25.9 |
| Quintile 2 | 21.3 | 21.3 |
| Quintile 3 | 18.7 | 18.7 |
| Quintile 4 | 17.3 | 17.3 |
| Quintile 5 | 15.0 | 15.0 |
| Year of index date, % | ||
| 2001–2005 | 28.4 | 28.4 |
| 2006–2010 | 40.1 | 40.1 |
| 2011–2015 | 31.5 | 31.5 |
*Sex was unknown in 0.05% (n=57) of patients with COPD and 0.05% (n=57) of comparators.
†SES was unknown in 1.80% (n=2023) of patients with COPD and 1.80% (n=2023) of comparators. Unknown observations for sex and SES were coded as missing and included as a separate category in regression analysis.
‡Quintile 5 is the highest SES.
COPD, chronic obstructive pulmonary disease; SES, socioeconomic status.