Demographics of patients included in the trial
| Overall invited IDEAS participants (n=1051) | Control(n=435) | Fixed(n=312) | Lottery(n=304) | |
| Gender, n (%) | ||||
| Male | 609 (57.9) | 263 (60.5) | 170 (54.5) | 176 (57.9) |
| Female | 442 (42.1) | 172 (39.5) | 142 (45.5) | 128 (42.1) |
| Age (years), n (%) | ||||
| 16–25 | 12 (1.1) | 4 (0.9) | 2 (0.6) | 6 (2.0) |
| 26–35 | 37 (3.5) | 16 (3.7) | 10 (3.2) | 11 (3.6) |
| 36–45 | 113 (10.8) | 50 (11.5) | 27 (8.7) | 36 (11.9) |
| 46–55 | 181 (17.2) | 72 (16.6) | 53 (17.0) | 56 (18.4) |
| 56–65 | 235 (22.4) | 87 (20.0) | 81 (26.0) | 67 (22.0) |
| 66–75 | 237 (22.5) | 106 (24.4) | 68 (21.8) | 63 (20.7) |
| 76–85 | 173 (16.5) | 72 (16.5) | 54 (17.3) | 47 (15.5) |
| ≥86 | 63 (6.0) | 28 (6.4) | 17 (5.4) | 18 (5.9) |
| IMD decile, n (%) | ||||
| Most deprived 0≤IMD<10 | 29 (2.8) | 7 (1.6) | 9 (2.9) | 13 (4.3) |
| 10≤IMD<20 | 275 (26.2) | 127 (29.2) | 65 (20.8) | 83 (27.3) |
| 20≤IMD<30 | 252 (24.0) | 100 (23.0) | 85 (27.2) | 67 (22.0) |
| 30≤IMD<40 | 216 (20.5) | 87 (20.0) | 68 (21.8) | 61 (20.1) |
| 40≤IMD<50 | 158 (15.0) | 66 (15.2) | 51 (16.4) | 41 (13.5) |
| 50≤IMD<60 | 107 (10.2) | 43 (9.9) | 28 (9.0) | 36 (11.8) |
| 60≤IMD<70 | 14 (1.3) | 5 (1.1) | 6 (1.9) | 3 (1.0) |
| Distance from clinic (km) | ||||
| Mean (SD) | 2.7 (1.81) | 2.69 (1.82) | 2.81 (1.84) | 2.59 (1.79) |
| Years registered on screening programme | ||||
| Mean (SD) | 6.0 (2.17) | 6.0 (2.12) | 5.8 (2.23) | 6.0 (2.20) |
IDEAS, Incentives in Diabetic Eye Assessment by Screening; IMD, Index of Multiple Deprivation.