Table 1.

Description of the 1,336 patients.

Group	Subgroup	Description
Group Lobe	A (n = 346)	Lobectomy with selected lymph node biopsy or sampling
	B (n = 328)	Lobectomy with systematic lymph node dissection
	C (n = 577)	Lobectomy with lobar-selective lymph node dissection
	D (n = 13)	Lobectomy without any lymph node dissection
	E (n = 28)	Lobectomy with bilateral mediastinal lymphadenectomy
Group Sublobe	F (n = 3)	Sublobectomy with systematic lymph node dissection
	G (n = 13)	Sublobectomy with randomly lymph node dissection or sampling
	H (n = 28)	Sublobectomy without any lymph node dissection