Time of PET/CT Sensitivity Specificity PPV NPV
<12 weeks (n=98)* 55.2% 73.9% 47.1% 79.7%
≥ 12 weeks (n=18)* 33.3% 100.0% 100.0% 88.2%
Abbreviation: PPV=Positive Predictive Value; NPV=Negative Predictive Value
*n refers to number of neck sides
Table 3: Predictive value of PET/CT imaging based on timing.