The effectiveness of recruitment strategies on general practitioner’s survey response rates – a systematic review

Table 2 Quality assessment of included studies

Study ID	Allocation concealed?	Randomisation performed?	Blinding of participants & personnel?	Complete outcome data?	Absence of reporting bias?	Absence of other bias?	ITT analysis?
Monetary incentives
1. Asch et al., 1998 [26]	?	√	?	√	√	√	√
2. Deehan et al.,1997 [11]	?	√	?	?	√	?	√
3. Everett et al.,1997 [28]	?	√	?	√	√	?	√
4. James et al., 2011 [27]	?	√	?	?	√	√	X
Non-monetary incentives
5. Baron et al., 2001 [29]	?	√	?	?	√	√	√
6. McLaren and Shelley, 2000 [30]	?	√	?	?	√	?	X
7. Pit et al., 2013 [25]	X	√	X	?	√	√	√
8. Robertson et al.,2005 [31]	?	√	?	√	√	?	√
9. Thomson et al.,2004 [32]	?	√	?	?	√	?	√
Questionnaire design/ mode of delivery
10. Drummond et al., 2008 [34]	√	√	?	√	√	√	√
11. Hocking et al., 2006 [35]	X	√	?	√	√	?	√
12. Shosteck and Fairweather,1979 [36]	?	√	?	√	√	√	√
13.Seguin et al.,2004 [37]	?	√	?	√	√	?	√
14. Scott et al., 2011 [24]	X	√	X	?	√	√	√
Other design based strategies
15. Akl et al., 2011 [41]	X	√	?	?	√	?	√
16. Bonevski et al., 2011[40]	?	√	?	?	√	?	√
17. Gattellari et al., 2012[13]	X	√	X	?	√	√	√
18. Gupta et al.,1997 [39]	?	√	?	?	√	?	√
19. Maheux et al., 1989[42]	?	√	?	?	√	?	√
20. Olivarius and Andreasen, 1995 [43]	X	√	?	√	√	?	√
21. Pedrana et al.,2008 [44]	X	√	?	?	√	?	√
22. Pirotta et al.,1999 [38]	√	√	√	√	√	?	√
23. Ward et al., 1998 [33]	X	√	?	√	√	√	√

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