Involving hard-to-reach ethnic minorities in low-budget health research: lessons from a health survey among Moluccans in the Netherlands

Table 3 Association between recruitment strategy and response rate: comparing exposed and non-exposed districts, to different strategies

	Number of districts (N)		Response rate (%)
	Exposed	Non-exposed	Exposed	Non-exposed
Indirect recruitment strategy
Announcement letter	14	5	25.5	19.8
Information meeting	7	12	24.1	24.1
Local media	6	13	23.0	24.6
Social media	10	9	20.6	28.5
Direct recruitment strategy
Door-to-door collection	5	14	31.8	21.2
Involvement of community organizations	3	16	21.8	24.5
Other strategies
“Active” key informants^a	9	10	30.0	18.1

Response rates with more than 5 % increase between exposed and non-exposed communities are presented in italics
^aKey informants were considered to be ‘active’ if they made major effort during the recruitment process (see text for the details)