Specificity and sensitivity of combined assays
| Assays | Hsa 13 combined | Hsa 18 combined | Hsa 21 combined |
|---|---|---|---|
| Mean control | 50 | 50 | 50 |
| SD control | 1.27 | 1.11 | 0.9 |
| Mean trisomic | 59.8 | 58.3 | 59.6 |
| SD trisomic | 1.32 | 1.11 | 1.05 |
| Number of samples | 91 | 89 | 105 |
| Number of uncertain samples | 1 | 0 | 0 |
| Sensitivity | 0.97 | 1 | 1 |
| Specificity | 1 | 1 | 1 |