Comparison of attendees and non-attendees of the second (T1) screening round
| Variable | T1 Screening round | P values | ||
| Attendees | Non- attendees | |||
| No of attendees (%) | 1194 | 129 | – | |
| Mean age (years±SD) | 64.7 (5.4) | 64.2 (5.6) | 0.34 | |
| Sex M/F (F%) | 587/607 (50.8) | 65/64 (49.6) | 0.79 | |
| Median IMD rank (IQR) | 2848 (3615) | 2908 (4195) | 0.79 | |
| BMI (±SD) | 28.5 (5.4) | 28.3 (5.7) | 0.73 | |
| Lung cancer risk (PLCOM2012±SD) | 4.8 (3.8) | 5.4 (4.7) | 0.13 | |
| Education (%) | Less than ‘O’ level | 822 (68.8) | 93 (72.1) | 0.58 |
| ‘O’ level | 213 (17.8) | 24 (18.6) | ||
| ‘A’ level | 44 (3.7) | 3 (2.3) | ||
| University/college | 77 (6.4) | 5 (3.9) | ||
| University degree | 26 (2.2) | 4 (3.1) | ||
| Postgraduate/professional | 12 (1.0) | 0 | ||
| Smoking status (%) | Current | 604 (50.6) | 82 (63.6) | 0.005 |
| Former | 590 (49.4) | 47 (36.4) | ||
| Smoking exposure (mean±SD) | Duration (years) | 43.4 (8.3) | 45.4 (7.0) | 0.008 |
| Cigarettes/day | 24.1 (12.8) | 23.9 (12.5) | 0.83 | |
| Pack-years | 51.2 (25.9) | 53.4 (28.6) | 0.37 | |
| Spirometry (mean±SD) | FEV1 | 2.16 (0.7) | 2.08 (0.7) | 0.26 |
| % predicted FEV1 | 84.9 (24.5) | 81.0 (21.6) | 0.09 | |
| FVC | 3.17 (1.0) | 3.10 (1.0) | 0.44 | |
| % predicted FVC | 100.4 (24.6) | 96.3 (23.7) | 0.07 | |
| FEV1:FVC ratio | 67.9 (10.7) | 67.6 (12.3) | 0.75 | |
| Airflow obstruction | Yes (%) | 588 (49.6) | 63 (53.1) | 0.45 |
| COPD/emphysema | Yes (%) | 386 (32.2) | 37 (28.7) | 0.40 |
| FH lung cancer | Yes (%) | 326 (27.3) | 32 (24.8) | 0.54 |
| MRC Dyspnoea Score (%) | 1 | 781 (65.4) | 72 (55.8) | 0.13 |
| 2 | 261 (21.9) | 32 (24.8) | ||
| 3 | 98 (8.2) | 14 (10.9) | ||
| 4 | 53 (4.4) | 11 (8.5) | ||
| 5 | 1 (0.1) | 0 | ||
| Performance status (%) | 0 | 655 (54.9) | 60 (46.5) | 0.12 |
| 1 | 403 (33.8) | 46 (35.7) | ||
| 2 | 116 (9.7) | 19 (14.7) | ||
| 3 | 20 (1.7) | 4 (3.1) | ||
| 4 | 0 | 0 | ||
BMI, Body Mass Index; FH, family history; IMD, Index of Multiple Deprivation; MRC, Medical Research Council.