Table 1.
Characteristics of Study Participants, by Phenotype and Race/Ethnicity, for the Health ABC Studya
| Characteristic | FEV1 Phenotype | FEV1/FVC Phenotype | ||
|---|---|---|---|---|
| African Americans |
European Americans |
African Americans |
European Americans |
|
| No. of participants | 1,022 | 1,487 | 979 | 1,469 |
| No. spirometry measurements | 2,432 | 4,157 | 2,244 | 4,018 |
| Males | 441 (43.2) | 773 (52.0) | 431 (44.02) | 766 (52.1) |
| Age at baseline (yr) | 73.4 (2.9) | 73.8 (2.9) | 73.4 (2.9) | 73.8 (2.9) |
| Height at baseline (cm) | 165.3 (9.4) | 166.7 (9.2) | 165.5 (9.5) | 166.7 (9.2) |
| Study site | ||||
| Memphis, TN | 469 (45.9) | 727 (48.9) | 439 (44.8) | 714 (48.6) |
| Pittsburgh, PA | 553 (54.1) | 760 (51.1) | 540 (55.2) | 755 (51.4) |
| Smoking status during follow-up | ||||
| Never smokers | 448 (43.8) | 649 (43 6) | 423 (43.2) | 638 (43.4) |
| Persistent smokers | 112 (11.0) | 48 (3.2) | 107 (10.9) | 48 (3.3) |
| Intermittent smokers | 62 (6.1) | 57 (3.8) | 60 (6.1) | 57 (3.9) |
| Former smokers | 400 (39.1) | 733 (49.3) | 389 (39.7) | 726 (49.4) |
| Pack-years at baselineb | 22.0 (1 – 126) | 28.5 (1 – 192) | 22.0 (1 – 126) | 29.0 (1 – 192) |
| FEV1 at baseline (ml) | 1924.4 (565.4) | 2288.6 (645.0) | - | - |
| FEV1/FVC at baseline (%) | - | - | 75.1 (8.3) | 74.2 (7.5) |
Abbreviations: FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity.
a
Data are presented as n, n (%), mean (standard deviation), or median (range).
b
Data for ever-smokers only.