Table 1. Number of participants, GPs, and practices recruited as a result of various interventions across seven categories, and spanning 20 studies.
| Study | Face to face
recruitment initiatives |
Language
adaptations |
Postal invitations
and responses |
Randomisation
methods |
Trial awareness
strategies aimed at the recruitee |
Trial awareness
strategies aimed at the recruiter |
Use of networks
and databased |
Total number of
participants (pts) /GPs/practices recruited |
|---|---|---|---|---|---|---|---|---|
| Andersen 2010 | 87 | 100 | 187 pts | |||||
| Barrera 2014 | A: 563
B: 2012 |
2575 pts | ||||||
| Beauharnais 2012 | A: 20 | 31 pts | ||||||
| B: 11 | ||||||||
| Bell-Syer 2000 | 104 | 83 | 187 pts | |||||
| Bhar 2013 | 27 | 6 | 33 pts | |||||
| Brealey 2007 | A: 322 | 553 pts | ||||||
| B: 231 | ||||||||
| Carr 2010 | 69 | 0 | 69 pts | |||||
| Carter 2015 | 72 | 35 | 13 | 120 pts | ||||
| Colwell 2012 | A: 36 | 54 GP
practices |
||||||
| B1: 11 | ||||||||
| B2: 7 | ||||||||
| Elley 2007 | 90 | 222 | 312 pts | |||||
| Embi 2005 | A: 35 | 59 pts | ||||||
| B: 24 | ||||||||
| Funk 2012 | A: 161
B: 308 |
469 pts | ||||||
| Gill 2001 | 101 | 87 | 188 pts | |||||
| Johnson 2015 | 4 | A: 28 | 5 | 89 pts | ||||
| B: 27 | ||||||||
| C: 14 | ||||||||
| 11 from ‘unknown non-targeted’ methods | ||||||||
| Lamont 2010 | A: 1188
B: 1181 C: 339 |
2708 pts | ||||||
| Sawhney 2014 | A: 77.7% | 212 pts | ||||||
| B: 45.0% | ||||||||
| Shah 2014 | A: 32
B: 84 C: 34 |
150 GPs | ||||||
| Treweek 2010 | 9 | 9 | 11 | 29 pts | ||||
| Park 2007 | A: 254 | 442 pts | ||||||
| B: 188 | ||||||||
| Weng 2010 | A: 30 | 44 pts | ||||||
| B: 14 | ||||||||
Letters, e.g. ‘A’, refer to more than one intervention tested within the same intervention category. Numbers, e.g. ‘B1’, refer to instances where the same intervention was tested more than once within a study.