Table 1.
Characteristics of the subjects included in the identification (LifeLines I) and replication (LifeLines II and Vlagtwedde-Vlaardingen) cohorts
| Identification LifeLines I |
Replication | ||
|---|---|---|---|
| LifeLines II | Vlagtwedde-Vlaardingen | ||
| N | 7,976 | 5,260 | 1,521 |
| Male, n (%) | 3,420 (43) | 2,112 (40) | 805 (53) |
| Age (yrs), median (min-max) | 47 (18–88) | 48 (20–89) | 53 (35–91) |
| Current smokers, n (%) | 1,904 (24) | 1,051 (20) | 548 (36) |
| Smoking status, n (%) | |||
| Ever | 4,737 (60) | 3,050 (59) | 1,054 (69) |
| Never | 3,208 (40) | 2,133 (41) | 467 (31) |
| Respiratory symptoms, n (%) | |||
| Cough | 1275 (16) | 776 (15) | 175 (12) |
| Dyspnea | 1097 (17) | 749 (17) | 338 (22) |
| Phlegm | 872 (11) | 534 (11) | 147 (10) |