Table 4. Examination of lymph node metastasis negative cases among lymph node dissection.

Variables	Cut-off	No. patients	Sensitivity
cT	Tis/T1mi/T1a (CD <10 mm)	95	38.2%
CD	12.5 mm	116	47.2 %
MD	10.6 mm	141	57.3 %
C/T	0.55	91	37.0%
SUVmax	NA	NA	NA

100% PPV cutoff value for lymph node metastasis. Total number of patients = 249.

C/T: CD/T; CD: maximal consolidation diameter evaluated with lung window setting; T: total tumor diameter evaluated with lung window setting; MD: maximal diameter evaluated with mediastinal window setting; NA: not available, because the variable did not reach PPV 100%; SUVmax: maximum standardized uptake value; PPV: positive predictive value