Table 3.
Predictive values for the QUANTEC guidelines and the developed NTCP models
| Cut-off point (Gy) |
SEF |
QoL |
||
|---|---|---|---|---|
| PPV (%) | NPV (%) | PPV (%) | NPV (%) | |
| 20-QUANTEC |
19.2 |
100 |
23.1 |
100 |
| 25-QUANTEC |
20.0 |
100 |
24.0 |
100 |
| 43.6-SEF-NTCP |
50.0 |
92.0 |
45.5 |
95.0 |
| 44.1-QoL-NTCP | 50.0 | 88.9 | 55.6 | 95.5 |
Abbreviation: SEF salivary excretion factor, QoL quality of life, PPV positive predictive value, NPV negative predictive value, NTCP normal tissue complication probability, QUANTEC Quantitative Analyses of Normal Tissue Effects in the Clinic.