Table 1 Characteristics of study participants
Characteristics | COPDGene training sample | COPDGene testing sample | ECLIPSE | p |
|---|---|---|---|---|
n | 734 | 735 | 571 | Â |
Age in years (mean (SD)) | 65.08 (8.53) | 64.91 (8.60) | 64.04 (6.10) | 0.054 |
Sex (No. (%) female) | 341 (46.5) | 371 (50.5) | 195 (34.2) |  < 0.001 |
Race (No. (%) African American) | 178 (24.3) | 171 (23.3) | 0 (0.0) |  < 0.001 |
Pack-years of smoking (mean (SD)) | 43.71 (23.86) | 42.38 (21.85) | 47.27 (26.45) | 0.002 |
Current smoking status (No. (%)) | 253 (34.5) | 250 (34.1) | 129 (22.6) |  < 0.001 |
Outcomes | Â | Â | Â | Â |
 ILA (No. (%)) * | 122 (16.6) | 126 (17.1) | 37 (6.5) |  < 0.001 |
 Dead (No. (%)) | 84 (11.4) | 73 (9.9) | 107 (30.7) |  < 0.001 |
 Days followed (median [IQR]) | 1881.00 [1603.75, 2104.00] | 1916.50 [1631.50, 2140.75] | 2848.00 [1425.00, 2926.00] |  < 0.001 |