Table 3. Validity and predictive accuracy of HemoTypeSC screening test.
| Hb | HemoTypeSC | HPLC | HemoTypeSC | HemoTypeSC | HemoTypeSC | HemoTypeSC |
|---|---|---|---|---|---|---|
| Freq. (%) | Freq. (%) | Sensitivity | Specificity | PPV | NPV | |
| TP/(TP+FN) * | TN/(FP+TN) * | TP/(TP+FP) * | TN/(TN+FN) * | |||
| AA | 185 (74.0%) | 185 (74.0%) | 185/185 = 100% | 65/65 = 100% | 185/185 = 100% | 65/65 = 100% |
| AS | 53 (21.2%) | 53 (21.2%) | 53/53 = 100% | 197/197 = 100% | 52/52 = 100% | 197/197 = 100% |
| AC | 9(3.6%) | 9 (3.6%) | 9/9 = 100% | 241/241 = 100% | 9/9 = 100% | 241/241 = 100% |
| SS | 1 (0.4%) | 1 (0.4%) | 1/1 = 100% | 249/249 = 100% | 1/1 = 100% | 249/249 = 100% |
| SC | 1 (0.4%) | 1 (0.4%) | 1/1 = 100% | 249/249 = 100% | 1/1 = 100% | 249/249 = 100% |
| CC | 1 (0.4%) | 1 (0.4%) | 1/1 = 100% | 249/249 = 100% | 1/1 = 100% | 249/249 = 100% |
*TP (true positive); FN (false negative); TN (true negative); FP (false positive) PPV (positive predictive value); (NPV (negative predictive value)