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

Table 4 Serum levels of TC, LDL and APOB in X⁺X^- and X^-X^- groups (mean ± SD)

	X+X- group	X-X- group	P value
	(n = 24)	(n = 162)
Total cholesterol (mmol/L)
Before surgery	4.02 ± 1.12	3.48 ± 0.88	0.004
After surgery	3.88 ± 1.09	3.40 ± 0.86	0.008
Low-density lipoprotein (mmol/L)
Before surgery	2.21 ± 0.96	1.89 ± 0.84	0.042
After surgery	2.09 ± 0.95	1.72 ± 0.85	0.029
Apolipoprotein B (μg/L)
Before surgery	0.73 ± 0.15	0.70 ± 0.12	0.142
After surgery	0.72 ± 0.14	0.68 ± 0.12	0.072

TC: Total cholesterol; LDL: Low-density lipoprotein; APOB: Apolipoprotein B.