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Table 2 Number and percentage of invitations sent out according to the method of invitation

From: Pre-notification and reminder SMS text messages with behaviourally informed invitation letters to improve uptake of NHS Health Checks: a factorial randomised controlled trial

   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)   1883 (57.3) 1561 (53.7) 1621 (54.1) 1654 (54.1)   3363 (54.7) 3356 (55.1)  
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)   118 (3.6) 118 (4.1) 111 (3.7) 128 (4.2)   245 (4.0) 230 (3.8)  
Black 1732 (28.2) 1664 (27.3)   919 (28.0) 816 (28.1) 812 (27.1) 849 (27.8)   1687 (27.4) 1709 (28.0)  
Other 591 (9.6) 594 (9.7)   309 (9.4) 285 (9.8) 313 (10.5) 278 (9.1)   595 (9.7) 590 (9.7)  
Not recorded 1015 (16.5) 932 (15.3)   561 (17.1) 432 (14.9) 454 (15.2) 500 (16.4)   1030 (16.8) 917 (15.0)  
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)   1432 (43.6) 1298 (44.6) 1323 (44.2) 1380 (45.2)   2734 (44.5) 2699 (44.3)  
3 593 (9.7) 644 (10.6)   330 (10.1) 312 (10.7) 292 (9.8) 303 (9.9)   608 (9.9) 629 (10.3)  
4 216 (3.5) 182 (3.0)   90 (2.7) 91 (3.1) 128 (4.3) 89 (2.9)   194 (3.2) 204 (3.4)  
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   6139 (100) 6105 (100)   3285 (100) 2908 (100) 2996 (100) 3055 (100)   6148 (100) 6096 (100)  
  1. a Chi2 test unless otherwise specified b One-way analysis of variance