Table 1.

Demographic characteristics of the populations of blood donors from the Blood Establishments in the areas included in the study in the year 2017.

	Donors from Areas Affected by CHIKF in 2017		Donors from Areas Not Affected by CHIKF in 2017		Overall
	No.	%	No.	%	No.	%
Age bracket
18–25 years	11,445	13.9	2237	14.3	13,682	14.0
26–35 years	13,387	16.3	2908	18.6	16,295	16.7
36–45 years	21,765	26.5	4138	26.5	25,903	26.5
46–55 years	25,038	30.5	4224	27.1	29,262	29.9
56–65 years	10,327	12.6	2031	13.0	12,358	12.6
>65 years	190	0.2	57	0.4	247	0.3
Sex
Female	25,275	30.8	4281	27.5	29,556	30.2
Male	56,877	69.2	11,314	72.5	68,191	69.8
Total	82,152	100.0	15,595	100.0	97,747	100.0