Table 2. Association between ABO blood types and risk of functional- and non-functional -pancreatic neuroendocrine tumors development: univariate and multivariate logistic regression analyses.

	F-PNET, n	Controls, n	AOR* (95%CI)	P
O	87	165	1 (reference)	-
A	70	169	0.87(0.59-1.28)	0.475
B	67	153	0.86(0.58-1.28)	0.455
AB	20	55	0.71(0.39-1.26)	0.241
(A vs.) Non-A	164	373	0.96(0.67-1.35)	0.830
(B vs.) Non-B	187	389	0.95(0.68-1.36)	0.795
(O vs.) Non-O	157	377	1.19(0.86-1.65)	0.296

	NF-PNET, n	Controls, n	AOR* (95%CI)	P
O	46	165	1 (reference)
A	44	169	1.01(0.62-1.63)	0.982
B	38	153	0.96(0.58-1.60)	0.885
AB	14	55	1.18(0.58-2.38)	0.650
(A vs.) Non-A	98	373	1.00(0.66-1.51)	0.990
(B vs.) Non-B	104	389	0.94(0.61-1.45)	0.778
(O vs.) Non-O	96	377	1.02(0.67-1.50)	0.966

Note: *, Multivariate adjustments included age (continuous), gender, smoking status (ever vs. never), alcohol drinking (ever vs. never), a first degree family history of any cancer (yes vs. no).