Table 1.

Sample socio-demographic characteristics from the 2 study sites^(a).

	Curarrehue(n = 321)	%	Corral (n = 319)	%	Total (n = 600)	%	p value(b)
Age (mean, years)	48.2		51.5		49.9		0.019
Sex
Female	197	61	198	62	395	62	0.46
Ethnicity
Mapuche	219	68	82	26	301	47	0.000
Other indigenous	0	0	2	0	2	0
Not indigenous	102	32	233	74	335	53	0.000
Rural inhabitants	224	70	109	35	333	53	0.000
Years of formal studies (mean, years)	7		7.9		7.5		0.004
Housing
Concrete	1	0.3	28	9	29	5	0.000
Other	315	99.7	284	91	599	95
House Floor
Cemented floor	64	20	33	11	97	15	0.000
Wood floor	254	80	280	89	534	85	0.002
Dirt floor	0	0	1	0	1	0
Latrine	159	71	57	16	216	34	0.000

^(a)Comparison of the socio-demographic characteristics of the randomly selected subjects who agreed to answer the study survey from the communes of Curarrehue and Corral in southern Chile.

^(b)Differences in proportion of affirmative answers between study sites (Curarrehue and Corral) using chi-square test (χ²).