Learning curve of laparoscopy-assisted distal gastrectomy with systemic lymphadenectomy for early gastric cancer

Table 1 Characteristics and pathologic results of patients

	Total	1–50 cases	51–90 cases	P
Total number of patients	90	50	40
Age (yr, mean±SD)	55.7±12.0	56.3±11.3	54.9±12.9	0.6907
Sex ratio (male:female)	50:40	26:24	24:16	0.5854
Body mass index (kg/m2, mean±SD)	22.8±2.7	23.1±2.5	22.5±2.9	0.1700
Comorbidity (%)	29 (32.2)	13 (26.0)	16 (40.0)	0.2359
Method of reconstruction				0.5343
B–I	67	39	28
B–II	23	11	12
T stage				0.1758
Tis	2	1	1
Tm	66	33	33
Tsm	22	16	6
N stage				0.8439
N0	87	49	38
N1	3	1	2
Extent of lymphadenectomy				0.4709
D1+α	11	8	3
D1+β	68	36	32
D2	11	6	5
Retrieved LN number (mean±SD)	27.0±9.7	25.4±10.0	28.9±8.9	0.1330
Resection margin (cm, mean±SD)
Proximal	4.2±2.6	3.8±2.4	4.7±2.7	0.1472
Distal	5.1±3.1	5.0±3.1	5.3±3.0	0.5752

LN, lymph node; D1+α: D1+no. 7 LN; D1+β: D1+no. 7, 8a, 9 LN; D2: D1+β+no. 11p, 12a, 14v LN.