Effectiveness and cost of recruitment strategies for a community-based randomised controlled trial among rainwater drinkers

Table 3 Yield and cost effectiveness of methods for recruitment into the study

Strategy	Percent yield¹	Total cost²	Cost per household randomised³
Direct costs
Invitation letter	40.8	$ 31,534.22	$ 173.26
School	57.3	$ 7,507.00	$ 147.20
Newspaper advertising	39.5	$ 5,768.28	$ 339.31
Community	42.9	$ 2,736.40	$ 228.03
No direct costs
Other media	40.5	$ -	$ -
Family/Friend	44.4	$ -	$ -

¹Percent yield = 100 * (number of households randomised/total number of callers reporting the strategy)
²Total cost includes material and personnel cost for all methods.
³The 809 unscreened calls are not included in these calculations as it is not possible to attribute these calls to a specific recruitment strategy.

ISSN: 1471-2288