Table 3.

Prevalence rates (%) of Chagas disease for donors with inconclusive serology (Stratum III), according to the six covariates

					Prevalence
Covariate					Mean		SD
General					13.30		0.22
First time donor					15.22		0.25
Repeat donor					11.59		0.20
Age < 30 years					9.23		0.16
Age > 30 years					18.79		0.30
Male					9.90		0.17
Female					17.64		0.28
Endemic region
No					13.73		0.00
Yes					15.71		0.00
Contact with vector
No					11.98		0.00
Yes					19.38		0.00
Family history
No					9.55		0.00
Yes					18.19		0.00

SD: Standard Deviation