Figure 1

Relationship between type-II diabetes and risk of pancreatic cancer in case–control studies. Black square=point estimate (with area proportional to statistical ‘information’, based on inverse of variance of the OR provided by each study) and horizontal line=95% CI for observed effect in each study. ^*=adjustment for age and sex; ^**=adjustment for age, sex, smoking or a marker of social class; ^***=adjustment for age, sex, smoking and social class; ^****=adjustment for age, sex, smoking, social class and dietary variables.