Characteristics of study population.

Note.
AAll children were born from T. cruzi-infected mothers.
BAll children and adult subjects were living in Buenos Aires (non-endemic) by the time of the study.
CNumber of patients presenting electrocardiographic alterations.
DP<0.05, seropositive children born in areas endemic for T. cruzi infection vs. seropositive and seronegative children born in non-endemic areas by Fisher' s exact test.
EP<0.001 vs. seropositive and seronegative children, by Kruskal-Wallis test.
FP<0.05 vs. seronegative adults, by Kruskal-Wallis test.
ANE, abnormal findings in electrocardiography not relevant to Chagas disease; RBBB, right bundle branch block; PP, permanent pacemaker; G1, Group 1 of the Kuschnir grading system.