TABLE III. Risk factors for infection with Trypanosoma cruzi in the subjects studied.

		Risk factors + /infected (n)	Risk factors + /not infected (n)	Odds ratio (CI 95%)	p
Female sex		58/73	1,236/1,713	1.5 (0.8-2.6)	0.1836
Travel to endemic area		55/71	931/1,688	2.8 (1.5-4.9)	0.0002
Travel to rural area		28/47	480/853	1.1 (0.6-2)	0.7629
Seeing kissing bugs		37/73	300/1,698	4.8 (2.9-7.7)	< 0.0001
Received transfusions		7/73	107/1,703	1.6 (0.7-3.5)	0.2277
Familiar with Chagas		36/73	265/1,700	5.2 (3.2-8.4)	< 0.0001
Born from a mother who travel to endemic zone		69/73	1,402/1,702	3.7 (1.3-10.1)	0.0041
Nationality vs. others	Argentina	31/73	1,027/1,708	0.5 (0.3-0.7)	0.0033
	Bolivia	30/73	297/1,708	1.6 (0.9-2.6)	0.0661
	Paraguay	12/73	167/1,708	1.8 (0.9-3.4)	0.0726
Argentine-born in Santiago del Estero vs. other provinces		5/31	46/1,049	4.2 (1.5-11.4)	< 0.01

CI: confidence interval.