Table 1 Sensitivity and specificity of nested PCR to Plasmodium detection according to the different blood storage conditions.
Blood Storage Device | ||||
|---|---|---|---|---|
Microscopic examination | Thick Blood Smears | Filter-papers | ||
Positive | Negative | Positive | Negative | |
Positive | 40 | 22 | 45 | 17 |
Negative | 22 | 285 | 120 | 187 |
Total | 62 | 307 | 165 | 204 |
Sensitivity | 65% | 73% | ||
Specificity | 93% | 61% | ||
Observed concordance | 88% | 63% | ||
Kappa coefficient (95%) | 0.57 | 0.20 | ||