XbaI polymorphisms of apolipoprotein B gene: Another risk factor of gallstone formation after radical gastrectomy

Table 1 Demographic data of 186 gastric cancer patients who underwent gastrectomy with D2 dissection in the X⁺X^- and X^-X^- groups (mean ± SD) n (%)

	X+X- group	X-X- group	P value
	(n = 24)	(n = 162)
Age (yr)	52.4 ± 5.1	56.8 ± 7.4	0.998
Gender
Male	16 (66.7)	110 (67.9)	0.904
Female	8 (33.3)	52 (32.1)
BMI (kg/m2)	22.0 ± 1.2	21.7 ± 1.6	0.379
TNM stage1
IA	1 (4.2)	7 (4.3)	0.996
IB	4 (16.7)	31 (19.1)
II	8 (33.3)	52 (32.1)
IIIA	8 (33.3)	49 (30.3)
IIIB	3 (12.5)	23 (14.2)
Type of gastrectomy
Proximal gastrectomy	1 (4.2)	6 (3.7)	0.820
Distal gastrectomy	20 (83.3)	142 (87.7)
Total gastrectomy	3 (12.5)	14 (8.6)
Type of reconstruction
Without duodenal exclusion	14 (58.3)	96 (59.3)	0.991
With duodenal exclusion	10 (41.7)	66 (40.7)
Gallbladders motility after surgery
Normal	10 (41.7)	62 (38.3)	0.750
Abnormal	14 (58.3)	100 (61.7)

¹According to the Classification of IUCC. BMI: Body mass index.