Table 2.
Mean, standard deviation (SD), optical density range (OD), and specificity estimates for serum groups in ELISAs based on secreted and excreted antigen homogenates (ESEA antigens) from trypomastigote forms of T. cruzi.
| Group of individuals | Mean (OD) ± SD | Range DO min–max |
Sp % (DO 0,500) |
Sens % (DO 0,500) |
Sp % (DO 0,600) |
Sens % (DO 0,600) |
|---|---|---|---|---|---|---|
| Individuals negative for T. cruzi infection (n = 50) | 0.339 ± 0.222 | 0.073–1.129 | 80 | — | 88 | — |
| Chagas-positive individuals (n = 50) |
1.099 ± 0.323 | 0.474–1.888 | — | 98 | — | 98 |
| Leishmaniasis-positive individuals (n = 10) | 0.617 ± 0.244 | 0.370–1.137 | 30 | — | 60 | — |
| Individuals-positive for other parasitic diseases (n = 10) | 0.492 ± 0.275 | 0.205–0.921 | 50 | — | 60 | — |
OD: optical density; SD: standard deviation; min: minimum, max: maximum; Sens: sensitivity; Sp: specificity.