Table 1 Participant characteristics
|  | Overall (N = 1677) | Airflow limitation (N = 352) | Restriction (N = 229) | Non-cases (N = 1096) |
|---|---|---|---|---|
Female, % | 61 | 51 | 70 | 62 |
Age (years), median (IQR) | 55 (49, 61) | 59 (52, 65) | 56 (49, 61) | 53 (48, 60) |
Height (cm), median (IQR) | 165 (159, 173) | 168 (160, 176) | 163 (158, 169) | 165 (160, 173) |
BMI, median (IQR) | 29.7 (26.3, 33.8) | 27.7 (24.3, 31.5) | 31.5 (27.3, 35.7) | 29.9 (26.8, 33.8) |
Smoking, n (%) | ||||
 Never | 32 | 26 | 37 | 32 |
 Former | 30 | 26 | 28 | 32 |
 Current | 38 | 48 | 35 | 36 |
Center, % | ||||
 Arizona | 14 | 7 | 27 | 14 |
North Dakota and South Dakota | 43 | 29 | 47 | 46 |
 Oklahoma | 43 | 63 | 27 | 40 |
eGFR, median (IQR) | 100.7 (92.1, 107.5) | 97.7 (88.3, 105.2) | 101.7 (93.4, 107.9) | 101.1 (93.1, 108.0) |
Education (years), median (IQR) | 12 (10, 14) | 11 (9, 13) | 12 (9, 13) | 12 (10, 14) |
Prior TB diagnosis, % | 13 | 18 | 15 | 12 |
FEV1 (L), median (IQR) | 2.5 (2.0, 3.0) | 2.1 (1.6, 2.7) | 1.9 (1.6, 2.2) | 2.7 (2.3, 3.2) |
FVC (L), median (IQR) | 3.3 (2.7, 4.0) | 3.4 (2.7, 4.4) | 2.3 (1.9, 2.8) | 3.4 (2.9, 4.1) |
FEV1/FVC, median (IQR) | 76.5 (71.1, 75.3) | 65.2 (59.2, 68.2) | 80.3 (75.7, 85.9) | 77.8 (74.8, 81.4) |