Effectiveness and cost of study recruitment campaigns
| Recruitment campaign (data missing for n=4 registered participants) | Participant status | All participants | By ethnicity* | Campaign cost (NZ$) | |||||
| Māori | Pacific | Other | total | Per randomised participant | Per completed participant | ||||
| Internet and social media | Registered, n | 966 | 215 | 73 | 668 | 3047 | 5 | 6 | |
| Randomised, n (% of registered) | 584 (60) | 106 (49) | 38 (52) | 440 (66) | |||||
| Completed, n (% of randomised) | 507 (87) | 91 (86) | 32 (84) | 384 (87) | |||||
| Radio | Registered, n | 25 | 10 | 15 | 0 | 2500 | 179 | 192 | |
| Randomised, n (% of registered) | 14 (56) | 4 (40) | 10 (67) | 0 | |||||
| Completed, n (% of randomised) | 13 (93) | 3 (75) | 10 (100) | 0 | |||||
| Print media and team networks | Supermarket ad | Registered, n | 3 | 0 | 0 | 3 | 2830 | 4 | 4 |
| Randomised, n (% of registered) | 1 (33) | 0 | 0 | 1 (33) | |||||
| Completed, n (% of randomised) | 1 (100) | 0 | 0 | 1 (100) | |||||
| Word of mouth | Registered, n | 506 | 76 | 27 | 394 | ||||
| Randomised, n (% of registered) | 343 (68) | 45 (59) | 20 (74) | 278 (71) | |||||
| Completed, n (% of randomised) | 306 (89) | 34 (76) | 18 (90) | 254 (91) | |||||
| Email invitation | Registered, n | 216 | 42 | 19 | 154 | ||||
| Randomised, n (% of registered) | 150 (69) | 25 (60) | 12 (63) | 113 (73) | |||||
| Completed, n (% of randomised) | 141 (94) | 22 (88) | 10 (83) | 109 (96) | |||||
| Newspaper or newsletter | Registered, n | 156 | 29 | 8 | 117 | ||||
| Randomised, n (% of registered) | 111 (71) | 23 (79) | 3 (38) | 85 (73) | |||||
| Completed, n (% of randomised) | 99 (89) | 20 (87) | 2 (67) | 77 (91) | |||||
| Other | Registered, n | 228 | 54 | 11 | 161 | ||||
| Randomised, n (% of registered) | 151 (66) | 39 (72) | 4 (36) | 108 (67) | |||||
| Completed, n (% of randomised) | 132 (87) | 30 (77) | 3 (75) | 99 (92) | |||||
| Total recruited | Registered, n† | 2104 | 427 | 152 | 1501 | 8377 | 6 | 7 | |
| Randomised, n (% of registered) | 1357 (64) | 243 (57) | 87 (57) | 1027 (68) | |||||
| Completed, n (% of randomised) | 1202 (89) | 201 (83( | 75 (86) | 926 (90) | |||||
*Ethnicity data were missing for n=24 registered participants.
†Total number of registrations in the table/analysis (n=2104) is less than that recorded in the study (n=2448) because a number of people did not complete the registration questionnaire so data were not available on recruitment strategy for those participants.
NZ, New Zealand.