ABO blood type, long-standing diabetes, and the risk of pancreatic cancer

Table 2 Comparison of characteristics among 3 diabetes mellitus subgroups according to duration of diabetes

Variables	DM-S (n = 31)	DM-M (n = 48)	DM-L (n = 35)	P value
Sex ratio (M/F)	2.44	2.69	2.18	0.91
Age, yr (mean ± SD)	64.8 ± 9.2	67.1 ± 9.8	71.7 ± 7.0	0.007
≥ 70	41.9%	47.9%	71.4%	0.03
Smoking status	n = 261	n = 43	n = 30	0.12
Former and current smokers	50.0%	72.1%	53.3%
Tumor location: Head	54.8%	47.9%	51.4%	0.83
Family history of DM	n = 16	n = 36	n = 24	0.64
Positive family history of DM	56.3%	44.4%	41.7%
ABO blood type	n = 26	n = 44	n = 34	0.03
A	19.2%	52.3%	20.6%
B	26.9%	18.2%	38.2%
O	42.3%	27.3%	32.4%
AB	11.5%	2.3%	8.8%

¹Because of missing data, the numbers of subjects are presented for smoking status, family history of diabetes and ABO blood type in each group. F: Female; M: Male; DM: Diabetes mellitus; DM-S: Patients with diabetes of 3-5 years; DM-M: Patients with diabetes of 5.1-14.9 years; DM-L: Patients with diabetes of 15 years or more.