Table 3.

Reasons for refusing participation in the study

	Rural	Migrant	Urban	Total	Proportion*
	n	n	n	n	%
Access to health care
Total	0	46	46	92	32.6%
Have social security insurance	0	26	33	59	20.9%
Have access to medical check-ups if wanted/needed	0	20	13	33	11.7%
Unwillingness to participate
Total	0	43	24	67	23.8%
Distrust (e.g. disclosure of personal details, signature)	0	13	12	25	8.9%
"Do not want to participate" statement	0	11	7	18	6.4%
Did not want blood samples to be taken	0	12	4	16	5.7%
Negativism from relative of selected participant	0	7	1	8	2.8%
Logistical
Total	1	17	32	50	17.7%
Time constraints due to working	0	6	12	18	6.4%
Time constraints, unspecified	0	5	13	18	6.4%
Travelling	0	4	1	5	1.8%
Other**	1	2	6	9	3.2%
Health status
Total	0	16	14	30	10.6%
Recent laboratory test done, no results provided	0	9	5	14	5.0%
Sickness, non-CVD	0	2	5	7	2.5%
Recent laboratory test done, negative for CVD risk factors	0	1	3	4	1.4%
Sickness, unspecified	0	3	0	3	1.1%
Sickness, CVD***	0	1	1	2	0.7%

Notes: Reasons for refusal shown in this table are not mutually exclusive and were aggregated using four categories. The same individual could have answer more than one option.

* This proportion is calculated using the total of responses as numerator and the total of non-responders (n = 282) as denominator

** Other category included the following reasons: 4 religious beliefs or ideologies, 3 fieldwork mistakes with appointments, 1 pregnant, 1 do not live permanently in the area

*** Sickness CVD included 1 case with diagnosed diabetes and 1 case with diagnosed hypercholesterolaemia. In both cases treatment status was not specified.