Baseline characteristics of the participants in the Danish Lung Cancer Screening Trial (DLCST)
| Parameter | CT group | Control group |
|---|---|---|
| Gender (M/F) | 1147/905 | 1120/932 |
| Mean age (years) (range) | 57.9 (49–71) | 57.8 (49–71) |
| Mean pack years (SD) | 36.4 (13.4) | 35.9 (13.4) |
| Mean age (years) at smoking start (SD) | 17.0 (3.8) | 17.1 (5.7) |
| Mean cigarettes per day (SD) | 19.1 (4.4) | 18.8 (4.3) |
| Smoking status smokers /ex-smokers | 1545/507 | 1579/473 |