Table 1 Baseline characteristics of the study population by respiratory disease group.
From: Exploring health consequences of Asthma-COPD overlap syndrome in a national study
Characteristic | No respiratory disease (n = 20,916) | Asthma only (n = 2,572) | COPD only (n = 1,819) | ACOS (n = 675) | P-valueᵃ |
|---|---|---|---|---|---|
Age (mean ± SD) | 70.0 ± 7.5 | 70.2 ± 7.5 | 70.5 ± 7.0 | 71.1 ± 6.5 | <0.001 |
Sex, % | <0.001 | ||||
Male | 48.5 | 39.2 | 46.8 | 41.3 | |
Female | 51.5 | 60.8 | 53.2 | 58.7 | |
Race/Ethnicity, % | <0.001 | ||||
Non-Hispanic White | 62.8 | 65.4 | 75.6 | 72.8 | |
Non-Hispanic Black | 11.6 | 13.2 | 9.3 | 11.5 | |
Hispanic | 17.2 | 13.8 | 9.4 | 10.1 | |
Other | 8.4 | 7.6 | 5.7 | 5.6 | |
Education, % | <0.001 | ||||
<High school | 8.9 | 10.2 | 16.8 | 18.9 | |
High school graduate | 26.7 | 28.4 | 34.2 | 36.5 | |
Some college | 30.8 | 32.6 | 29.5 | 28.7 | |
≥College graduate | 33.6 | 28.8 | 19.5 | 15.9 | |
Annual income, % | <0.001 | ||||
<$25,000 | 18.2 | 24.6 | 35.8 | 42.3 | |
$25,000–49,999 | 23.4 | 26.1 | 28.9 | 27.6 | |
$50,000–74,999 | 17.8 | 15.9 | 13.2 | 11.8 | |
≥$75,000 | 40.6 | 33.4 | 22.1 | 18.3 | |
Smoking status, % | <0.001 | ||||
Never smoker | 60.2 | 54.8 | 23.5 | 21.2 | |
Former smoker | 24.1 | 26.7 | 48.9 | 43.6 | |
Current smoker | 15.7 | 18.5 | 27.6 | 35.2 | |
Pack-years (mean ± SD) | 8.2 ± 15.4 | 10.3 ± 17.2 | 32.5 ± 28.6 | 36.8 ± 30.2 | <0.001 |
Insurance status, % | <0.001 | ||||
Insured | 88.7 | 90.4 | 93.8 | 91.5 | |
Uninsured | 11.3 | 9.6 | 6.2 | 8.5 | |
Urban/Rural, % | 0.003 | ||||
Urban | 85.2 | 84.6 | 81.7 | 82.3 | |
Rural | 14.8 | 15.4 | 18.3 | 17.7 |
