Table 1 Participant and source population characteristics at ECLS study enrolment
|  | Interviewed (n = 31) | Source population (n = 376) (screened ECLS study participants completing follow-up questionnaires who smoked at enrolment) | ||
|---|---|---|---|---|
n (%) [missing] | Median Range [missing] | n (%) [missing] | Median Range [missing] | |
Age (years) |  | 58 51–74 [0] |  | 59 50–75 [0] |
Gender | ||||
 Man | 15 (48.4) |  | 198 (52.7) |  |
 Woman | 16 (51.6) [0] |  | 178 (47.3) [0] |  |
UK region | ||||
 Greater Glasgow & Clyde | 21 (67.7) |  | 268 (71.3) |  |
 Tayside | 10 (32.3) [0] |  | 108 (28.7) [0] |  |
Ethnicity | ||||
 White Scottish or White British | 30 (100) [1] |  | 366 (98.4) [4] |  |
Scottish Index of Multiple Deprivation | ||||
 1 (most deprived quintile) | 10 (32.3) |  | 164 (43.7) |  |
 2 | 8 (25.8) |  | 86 (22.9) |  |
 3 | 6 (19.4) |  | 50 (13.3) |  |
 4 | 5 (16.1) |  | 44 (11.7) |  |
 5 (least deprived quintile) | 2 (6.5) [0] |  | 31 (8.3) [1] |  |
At least one parent or sibling with a lung cancer diagnosis | ||||
 Yes | 6 (19.6) |  | 90 (23.9) |  |
 No | 25 (80.7) [0] |  | 286 (76.1) [0] |  |
Smoking pack year history |  | 40 20–175 [0] |  | 37 2–175 [0] |
Average no. cigarettes smoked a day |  | 15 2–60 [0] |  | 17 0–136 [2] |
Attempted to stop smoking in last 6Â months | ||||
 Yes | 9 (31.0) |  | 95 (25.8) |  |
 No | 20 (69.0) [2] |  | 273 (74.2) [8] |  |
Intend to stop smoking in next 4Â weeks | ||||
 Yes | 10 (32.3) |  | 90 (24.2) |  |
 Don’t know | 10 (32.3) |  | 100 (26.9) |  |
 No | 11 (35.5) [0] |  | 182 (48.9) [4] |  |
EarlyCDT-Lung result | ||||
 Positive | 13 (41.9) |  | 164 (43.6)a |  |
 Negative | 18 (58.1) [0] |  | 212 (56.4) [0] |  |