Table 1. Characteristics of subjects from the UK Biobank, COPDGene, and CAMP data.
For continuous variables, we give the mean and standard deviation (i.e. mean (sd)). Sample 1 is for FEV1 as the outcome. Sample 2 is for age at smoking cessation as the outcome and includes former smokers. Sample 3 is for FEV1 as the outcome for the subjects with the lowest 20% of FEV1.
| UK Biobank | COPDGene: non-Hispanic white | COPDGene: African American | CAMP | |
|---|---|---|---|---|
| Sample 1, n | 151,879 | 6,764 | 3,365 | 698 |
| FEV1 | 2.77 (0.75) | 2.22 (0.95) | 2.29 (0.86) | 1.83 (0.50) |
| Sex (male), n (%) | 88,406 (58.21) | 3,553 (52.53) | 1,856 (55.16) | 408 (58.45) |
| Age, years | 56.25 (7.98) | 62.02 (8.86) | 54.66 (7.21) | 8.85 (2.13) |
| BMI | 27.52 (4.86) | 28.68 (6.05) | 29.07 (6.66) | 17.78 (3.05) |
| Height, cm | 167.84 (9.08) | 169.74 (9.46) | 171.01 (9.67) | 132.84 (13.84) |
| Sample 2, n | 21,142 | 4,104 | 673 | - |
| Smoking cessation, age in years | 37.03 (10.33) | 50.92 (11.03) | 51.51 (9.66) | - |
| Education (college or university), n (%) | 9,201 (43.52) | 3,039 (74.05) | 341 (50.67) | - |
| Pack years | 18.09 (14.46) | 46.71 (26.96) | 38.51 (22.29) | - |
| Smoker in household, n (%) | 2,338 (11.06) | 3,268 (79.63) | 521 (77.41) | - |
| Age started smoking, years | 17.43 (3.18) | 16.95 (3.85) | 17.13 (4.97) | - |
| Sample 3, n | 29,805 | - | - | - |
| FEV1 | 1.81 (0.28) | - | - | - |
| Sex (male), n (%) | 26,078 (87.50) | - | - | - |
| Age, years | 61.00 (6.27) | - | - | - |
| BMI | 28.26 (5.53) | - | - | - |
| Height, cm | 160.77 (7.06) | - | - | - |