Table 1.
Participant characteristics.
| Standard reminder letter (n = 600) | GP-endorsed reminder letter (n = 600) | P-value | |
|---|---|---|---|
| Sex (n and %) | |||
| Male | 314 (52.3) | 308 (51.3) | 0.729 |
| Female | 286 (47.7) | 292 (48.7) | |
| IMD (mean and SD) | 21.3 (11.4) | 22.2 (11.9) | 0.184 |
| IMD quintile (mean and SD) | |||
| 1 (low deprivation) | 7.6 (2.4); n = 125 | 7.2 (2.5); n = 116 | 0.182 |
| 2 | 14.3 (1.9); n = 127 | 14.5 (1.9); n = 112 | 0.609 |
| 3 | 20.3 (1.4); n = 117 | 20.3 (1.5); n = 123 | 0.994 |
| 4 | 27.2 (2.1); n = 123 | 27.2 (2.3); n = 122 | 0.970 |
| 5 (high deprivation) | 39.8 (7.1); n = 108 | 39.9 (7.7); n = 127 | 0.952 |
| Clinical commissioning group (n and %) | |||
| Brent | 249 (41.5) | 261 (43.5) | 0.521 |
| Harrow | 138 (23.0) | 122 (20.3) | |
| Hillingdon | 213 (35.0) | 217 (36.2) | |
| Time from first invitation to reminder letter (n and %) | |||
| 14–17 months | 160 (26.7) | 197 (32.8) | 0.061 |
| 18–21 months | 318 (53.0) | 296 (49.3) | |
| 22+ months | 122 (20.3) | 107 (17.8) | |
IMD = index of multiple deprivation; SD = standard deviation. P-value refers to χ2 test for proportions and t-test for means and SD.