Table 1 Subject characteristics of the subjects from the four different DNA methylation datasets
From: DNA methylation is associated with lung function in never smokers
LL COPD&C | LLDEEP | RS-III-1 | RS-BIOS | |
|---|---|---|---|---|
Number of subjects, N (%) | 903 | 166 | 150 | 206 |
Male, N (%) | 508 (56.3) | 71 (42.8) | 74 (49.3) | 80 (38.8) |
Age (yrs), median (min-max) | 46 (18–80) | 42 (20–78) | 63 (53–93) | 68 (52–79) |
Airway obstruction (FEV1/FVC< 70%), N (%) | 316 (35.0) | 15 (9.0) | 13 (8.7) | 19 (9.0) |
- FEV1 (L), mean (SE) | 3.5 (0.9) | 3.6 (0.9) | 3.2 (0.8) | 2.7 (0.7) |
- FEV1/FVC, mean (SE) | 84.5 (8.2) | 78.6 (6.2) | 77.8 (5.9) | 77.9 (5.9) |