Table 3. Per patient frequency of extrapleural LN metastatic disease and frequency of false negative EBUS-TBNA LN assessment based on final pathology.

LN	Frequency of metastatic disease total, n (%)*¶	Frequency of false negative, n (%)*¶¶
EBUS-TBNA accessible LNs
2R	1 (2.1)	0
4R	3 (6.3)	2 (11.8)
4L	1 (2.1)	1 (5.9)
7	7 (14.6)	5 (29.4)
EBUS-TBNA inaccessible LNs
Internal mammary	2 (4.2)	2 (11.8)
8	2 (4.2)	1 (5.9)
9	1 (2.1)	1 (5.9)
Total	17/48 (35.4)	9/17 (52.9)

*, all frequencies are patient frequencies. Please note some patients had multiple nodal metastases, hence the total number of patients with nodal metastasis will not add up; ^¶, out of the total number of the study patients (n=48); ^¶¶, out of the total 17 surgical patients. EBUS-TBNA, endobronchial ultrasound transbronchial needle aspiration; LN, lymph node.