Learning Curve for D2 Lymphadenectomy in Gastric Cancer

Table 1

Postoperative morbidity and mortality (compared with POSSUM) between January 2005 and December 2011.

	D1	D2
Observed morbidity	59.4%	47.7%
Expected morbidity (POSSUM)	49.4%	33.7%
Ratio morbidity	1.202	1.415
Observed mortality	6.7%	6.8%
Expected mortality (O-POSSUM)	13.9%	7.2%
Ratio mortality	0.482	0.944