Table 3.

Prevalence of Trypanosoma cruzi infection and potential risk factors in 221 dogs from the area under pulsed control actions in Santiago del Estero, November 2002–July 2003.

Factor	% infected (n)	Unadjusted odds ratio (95% CI)	Adjusted odds ratio (95% CI)
Age (in months)	− (214)	1.0 (1.00–1.02)	1.0 (1.01–1.04)**
Sex
Male	9.5 (189)
Female	25.0 (32)	3.1 (1.2–8.1)	4.7 (1.1–21.0)*
Permanent residence in the study villages
No	7.1 (99)
Yes	15.6 (122)	2.4 (1.0–6.0)	3.8 (1.2–12.5)*
No. of infected dogs or cats the dog cohabited with
	− (221)	2.5 (1.7–3.5)	2.0 (1.4–2.9)**
Intensity of insecticide spraying (1994–2002)
Three times	7.6 (119)		-
Twice	18.1 (83)	1.1 (1.1–6.5)	-
Once or never	10.5 (19)	1.4 (0.3–7.2)	-
No. of T. infestans caught in domestic or nearby peridomestic sites at the dog’s compound
0	2.6 (117)
1–9	17.0 (53)	7.8 (2.0–30.0)	6.0 (1.4–24.9)*
≥ 10	31.7 (41)	17.6 (4.7–66.2)	6.7 (1.1–39.2)*
Proportion of infected T. infestans at the dog’s compound
	− (211)	23.0 (4.2–126.3)	5.1 (1.5–17.4)*

n, number of dogs examined for infection.

^*P < 0.05,

^**P < 0.01.