Table 2. Diagnostic values of PET and EBUS-TBNA in lung cancer patients with CT-defined radiologically normal mediastinum.

Tests	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)	Accuracy (%)
PET	85.7	18.9	44.4	63.6	47.7
PET*	69.2	41.0	43.9	66.7	52.3
EBUS-TBNA	80.6	100	100	85.7	91.0

*PET judgment directed by primary tumor location: Contralateral lymph nodes with 3 or 4-point scale FDG uptake were judged as having a negative PET result. CT: computed tomography; PET: positron emission tomography; EBUS-TBNA: endobronchial ultrasound-guided transbronchial aspiration.