Table 2.

Recruitment cost of strategies directly charged to the project.

Recruitment methods	Direct cost to project, US $	Number of enrolled participants, n	Cost per enrolled participantsa, US $	Duration, months	Number of enrolled participants per monthb, n
Facebook advertisement	76,339	1030	74	16	64
Telivision advertisement	52,994	277	191	6	46
Website banner advertisement	4260	11	387	2	6
Public bus interior cards	1285	2	643	1	2

^aCost per enrolled participant=direct cost divided by the enrolled participant.

^bEnrolled per month=enrolled participant divided by the duration.