5.

Univariate and multivariate analysis of risk factor for postoperative complication

Variable	n (%)		P	Multivariate analysis
	No complication group (N=1,145)	Complication group (N=177)		OR	P
ASA, American Society of Anesthesiologist; BMI, body mass index; EBL, estimated blood loss; LADG, laparoscopy-assisted distal gastrectomy; TLDG, totally laparoscopic distal gastrectomy; LND, lymph node dissection; OR, odds ratio.
Age (year)			0.11
<60	577 (50.4)	78 (44.1)
≥60	568 (49.6)	99 (55.9)
Sex			0.08
Male	745 (65.1)	127 (71.8)
Female	400 (34.9)	50 (28.2)
ASA score			0.001		0.04
1	389 (34.0)	45 (25.4)		1
2	692 (60.4)	112 (63.3)		1.35 (0.93−1.96)
3 or more	64 (5.6)	20 (11.3)		2.36 (1.29−4.31)
BMI (kg/m2)			0.37
<25	732 (63.9)	107 (60.5)
≥25	413 (36.1)	70 (39.5)
Tumor location
Antrum	640 (55.9)	108 (61.0)
Lower body	492 (43.0)	68 (38.4)
Mid body	13 (1.1)	1 (0.6)
EBL (mL)			0.06
<100	923 (80.6)	132 (74.6)
≥100	222 (19.4)	45 (25.4)
Operation time (min)			<0.001		0.002
<180	717 (62.6)	88 (49.7)		1
≥180	428 (37.4)	89 (50.3)		1.64 (1.19−2.27)
Type of laparoscopy			0.66
LADG	575 (50.2)	92 (52.0)
TLDG	570 (49.8)	85 (48.0)
Reconstruction			0.83
Billroth I	310 (27.1)	45 (25.4)
Billroth II	779 (68.0)	122 (68.9)
Roux-en-Y	56 (4.9)	10 (5.6)
Extent of LND			0.51
D1+	985 (86.0)	147 (83.1)
D2 or more	160 (14.0)	30 (16.9)
pStage			0.46
I	961 (83.9)	155 (87.6)
II	133 (11.6)	16 (9.0)
III	51 (4.5)	6 (3.4)