Table 3.

Reported cost and timeliness of included studies.

Reference	Study ID	Duration (days)	Participants	Response per day	Cost ($US)
					Per participant	Per click	Total
[15]	Ramo, 2012	390	1548	4	4.28	0.45	6628.24
[16]	Lohse, 2013	19	62	3	9.26	1.28	596.71
[12]	Fenner, 2012	150	278	2	20.14	0.67	5598.92
[21]	Strasser, 2012	16	100	1.6	–	–	–