|  | No pre-notification | SMS pre-notification | p-valuea | Control letter | Open-ended letter | Time-limited letter | Social norms letter | p-value | No reminder | SMS reminder | p-value |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Sex [n (%)] | Female | 2771 (45.1) | 2754 (45.1) | 0.976 | 1402 (42.7) | 1347 (46.3) | 1375 (45.9) | 1401 (45.9) | 0.012 | 2785 (45.3) | 2740 (45.0) | 0.696 |
Male | 3368 (54.9) | 3351 (54.9) | Â | 1883 (57.3) | 1561 (53.7) | 1621 (54.1) | 1654 (54.1) | Â | 3363 (54.7) | 3356 (55.1) | Â | |
Age at initiation [mean (s.d.)] | Years | 47.9 (8.1) | 48.0 (8.1) | 0.645b | 48.1 (8.2) | 47.8 (8.0) | 47.8 (8.0) | 47.9 (8.2) | 0.312b | 48.0 (8.14) | 47.8 (8.04) | 0.2983 |
Ethnicity [n (%)] | White | 2584 (42.1) | 2654 (43.5) | 0.035 | 1378 (42.0) | 1257 (43.2) | 1306 (43.6) | 1300 (42.6) | 0.353 | 2591 (42.1) | 2650 (43.5) | 0.106 |
Asian | 214 (3.5) | 261 (4.3) | Â | 118 (3.6) | 118 (4.1) | 111 (3.7) | 128 (4.2) | Â | 245 (4.0) | 230 (3.8) | Â | |
Black | 1732 (28.2) | 1664 (27.3) | Â | 919 (28.0) | 816 (28.1) | 812 (27.1) | 849 (27.8) | Â | 1687 (27.4) | 1709 (28.0) | Â | |
Other | 591 (9.6) | 594 (9.7) | Â | 309 (9.4) | 285 (9.8) | 313 (10.5) | 278 (9.1) | Â | 595 (9.7) | 590 (9.7) | Â | |
Not recorded | 1015 (16.5) | 932 (15.3) | Â | 561 (17.1) | 432 (14.9) | 454 (15.2) | 500 (16.4) | Â | 1030 (16.8) | 917 (15.0) | Â | |
Deprivation Quintile [n (%)] | 1 – most deprived | 2591 (42.2) | 2539 (41.6) | 0.183 | 1418 (43.2) | 1197 (41.2) | 1243 (41.5) | 1272 (41.6) | 0.097 | 2587 (42.1) | 2543 (41.7) | 0.855 |
2 | 2713 (44.2) | 2720 (44.6) | Â | 1432 (43.6) | 1298 (44.6) | 1323 (44.2) | 1380 (45.2) | Â | 2734 (44.5) | 2699 (44.3) | Â | |
3 | 593 (9.7) | 644 (10.6) | Â | 330 (10.1) | 312 (10.7) | 292 (9.8) | 303 (9.9) | Â | 608 (9.9) | 629 (10.3) | Â | |
4 | 216 (3.5) | 182 (3.0) | Â | 90 (2.7) | 91 (3.1) | 128 (4.3) | 89 (2.9) | Â | 194 (3.2) | 204 (3.4) | Â | |
5 – least deprived | 26 (0.4) | 20 (0.3) |  | 15 (0.5) | 10 (0.3) | 10 (0.3) | 11 (0.4) |  | 25 (0.4) | 21 (0.3) |  | |
Total | Â | 6139 (100) | 6105 (100) | Â | 3285 (100) | 2908 (100) | 2996 (100) | 3055 (100) | Â | 6148 (100) | 6096 (100) | Â |