Table 1. Number of interviewed families by country and exposure level^a.

Country	Department or State		Exposure level		Total
		High	Medium	Low
Nicaragua	Jinotega	12	14	15	41
	Matagalpa	36	20	5	61
	Madriz	4	14	14	32
	Nueva Segovia	0	0	16	16
	Total	50	50	50	150
El Salvador	Usulután	11	0	9	20
	Santa Ana	8	0	0	8
	La Libertad	4	11	14	29
	Ahuachapán	20	32	20	72
	Total	43	43	43	129
Guatemala	Chiquimula	14	23	10	47
	Sololá	17	2	4	23
	Chimaltenango	4	5	1	10
	San Marcos	8	13	28	49
	Total	43	43	43	129
México	Chiapas	4	0	32	36
	Oaxaca	45	30	11	86
	San Luis Potosí	1	20	7	28
	Total	50	50	50	150

^aFor the definition of exposure levels see section 2.3.