Table 2.

Sociodemographic characteristics of the study population.

Characteristics	Cases n = 50		Controls n = 50
	n	%	n	%
Age, year
<30	2	4	14	28
30-45	16	32	26	52
>45	32	64	10	20
Ethnic group
Mossi	28	56	43	86
Others	22	44	7	14
Profession
Pupils/Students	3	6	12	24
Civil servant	25	50	20	40
Housewife/informal sector	22	44	18	36
Marital status
Single	12	24	17	34
Married	33	66	32	64
Widow	5	10	1	2
Residence
Rural	4	8	2	4
Urban	46	92	48	96