Table 4. Summary of Delphi participants’ responses to recruitment experiences.
| Overall | Feasibility/ pilot trials | Full-scale trials | |
|---|---|---|---|
| Studies (N) | 21 | 11 | 10 |
| Target sample size | 80 (60-210) | 60 (45-70) | 225 (170-486) |
| Actual sample size | 79 (41-180) | 41(37-65) | 190 (131-375) |
| Initial recruitment duration (weeks) | 12 (7.5-52) | 8.5 (6-12) | 52 (10-68) |
| Percentage of studies where recruitment was extended | 33% | 36% | 30% |
| Recruitment extension duration (weeks) | 20 (8-37.5) | 8 (8-11) | 48 (37.5-50) |
| Enrolment rate (families per week) | 4 (2-9) | 3 (2-6) | 8(2-18) |
| Percentage of studies with under-recruitment | 62% | 55% | 70% |
Note. Median (interquartile range) values are presented unless indicated otherwise.