Table 1.
Participant baseline characteristics in DLCST (CT and control) and the reference group
| Characteristics | N/N/N | CT group (n=2052) | Control group (n=2052) | Reference group (n=535) |
| Sex, n (%) | ||||
| Men | 2052/2052/535 | 1147 (55.9) | 1120 (54.6) | 335 (62.6) |
| Women | 905 (44.1) | 932 (45.4) | 200 (37.4) | |
| Age (years), mean (SD) | 2052/2052/535 | 57.3 (4.8) | 57.3 (4.8) | 57.0 (4.4) |
| SG, n (%) | ||||
| I | 2041/2039/489 | 155 (7.6) | 141 (6.9) | 25 (5.1) |
| II | 402 (19.7) | 410 (20.1) | 69 (14.1) | |
| III | 378 (18.5) | 378 (18.5) | 88 (18.0) | |
| IV | 545 (26.7) | 551 (27.0) | 152 (31.1) | |
| V | 265 (13.0) | 282 (13.8) | 110 (22.5) | |
| Employed, SG uncertain | 182 (8.9) | 168 (8.2) | 25 (5.1) | |
| Outside the labour market | 114 (5.6) | 109 (5.4) | 20 (4.1) | |
| School education, n (%) | ||||
| 7–9 years in school | 2047/2047/533 | 698 (34.1) | 715 (34.9) | 241 (45.2) |
| 10 years in school | 775 (37.9) | 790 (38.6) | 151 (28.3) | |
| 12–13 years in school | 553 (27.0) | 532 (26.0) | 100 (18.8) | |
| Other | 21 (1.0) | 10 (0.5) | 41 (7.7) | |
| Vocational education | ||||
| None | 2043/2047/531 | 187 (9.2) | 201 (9.8) | 81 (15.3) |
| Semiskilled worker | 20 (1.0) | 27 (1.3) | 36 (6.8) | |
| Vocational training | 702 (34.4) | 724 (35.4) | 133 (25.1) | |
| Short further education | 199 (9.7) | 194 (9.5) | 41 (7.7) | |
| Middle further education | 506 (24.8) | 539 (26.3) | 110 (20.7) | |
| Long further education | 264 (12.9) | 225 (11.0) | 49 (9.2) | |
| Other | 165 (8.1) | 137 (6.7) | 81 (15.3) | |
| Employment status, n (%) | ||||
| Employed | 2043/2045/533 | 1366 (66.9) | 1324 (64.7) | 236 (44.3) |
| Studying | 9 (0.4) | 12 (0.6) | 0 | |
| Job seeking | 113 (5.5) | 104 (5.1) | 17 (3.2) | |
| Retired | 555 (27.2) | 605 (29.6) | 280 (52.5) | |
| Region of residence, n (%) | ||||
| Capital region | 2037/2044/535 | 1644 (80.7) | 1653 (80.9) | 163 (30.5) |
| Region Zealand | 353 (17.3) | 349 (17.1) | 72 (13.5) | |
| Region of Southern Denmark | 29 (1.4) | 28 (1.4) | 129 (24.1) | |
| Region of Central Denmark | 8 (0.4) | 11 (0.5) | 113 (21.1) | |
| Region of Northern Denmark | 3 (0.2) | 3 (0.2) | 58 (10.8) | |
| Living alone, n (%) | ||||
| No | 2039/2034/533 | 1457 (71.5) | 1453 (71.4) | 415 (77.9) |
| Yes | 582 (28.5) | 581 (28.6) | 118 (22.1) | |
| Smoking status, n (%) | ||||
| Current smoker | 2050/2051/534 | 1544 (75.3) | 1579 (77.0) | 276 (51.7) |
| Former smoker | 506 (24.7) | 472 (23.0) | 258 (48.3) | |
| Smoking history (pack years), mean (SD) | 2051/2048/535 | 36.4 (13.4) | 35.9 (13.4) | 36.9 (17.7) |
DLCST, Danish Randomised Controlled Lung Cancer Screening Trial; SD, Standard Deviation; SG, social group.