Characteristics of selected pancreatic cancer cases and controls, case-control study in urban Shanghai.

aContinuous variables were expressed as median (interquartile) and categorical variables were expressed as frequency(percentage among cases or controls).bP-value were calculated from student’s t test for continuous variables and χ2-test for categorical variables.cP-value were calculated from Fisher’s exact test.dP-value were calculated from student’s t test for log10 transformed standardized PGE-M.Characteristics of selected pancreatic cancer cases and controls, case-control study in urban Shanghai.