Table 8.

Cost of recruitment strategies*

Author, year	Costs reported	Recruitment phase	Intervention/s	Randomised, n	Cost	Cost per participant
Bhar et al, 201338	Direct cost (stationary, postage, phone calls and catering) and indirect cost (staff time)	Identification of participants	Mass mailing—primary care patients mailing list	6	US$3813	US$636
			Health services referral—co-investigator’s Veteran’s Affairs mental health clinic	24	US$1066	US$44
			Health services referral—psychiatric outpatient clinic	3	US$497	US$166
			Health services referral—primary care physicians	0	US$643	N/A
			Health services referral—inpatient psychiatric unit	0	US$519	N/A
Chlebowski et al, 201040	Mailing cost (not further specified)	Identification of participants	Mass mailing—male home owners	600	US$155 596	US$259
			Mass mailing—spouses of previous female participant	34	US$2000	US$59
Donovan et al, 200349	Salary and on-costs for staff time	Participant information and consent	Recruitment visit performed by urologist	53	NR	£43.29
			Recruitment visit performed by nurse	50	NR	£36.40

*Poor quality studies excluded.

NR, not reported.