Table 1.PATIENT CHARACTERISTICS

Data are given as n (%).

Because of rounding, percentages may not add up to 100.

*P values given are for the chi-square test.

† The modified Charlson comorbidity score was calculated using medical diagnosis codes present on the initial hospitalization.

‡ Regional nodes include peripancreatic, hepatic, infrapyloric, superior mesenteric, retroperitoneal, and lateral aortic nodes for all tumor locations. Regional nodes for tumors of the head of the pancreas also include subpyloric and celiac nodes, and regional nodes for tumors of the body and tail of the pancreas include pancreaticolienal and splenic nodes.

§ Includes extension into duodenum, bile duct, stomach, spleen, colon, major blood vessels, kidney, ureter, and peripancreatic fat.