Sensitivity analyses
The results on all-cause mortality did not change either by varying the criteria for categorization of adherence with drug treatment (Additional file Additional file Finally, 61,722 cohort members were new users, i.e. they did not receive a prescription of antidiabetic drugs in the previous 5 years. Among these, 16,915 patients died during follow-up, of whom 16,897 were matched with alive new-user patients. The results did not change by restricting the cohort to new users (Additional file 