Table 1

Patient selection criteria for a retrospective claims database study of the risk of pancreatitis or biliary disease associated with type 2 diabetes

Patients remainingPatients removed
Enrolled in health plan at any time from 1 January 1999 through 31 December 200529,332,477
Total population aged ≥18 years as of 1 January 2000, continuous enrollment for ≥1 year from 1 January 1999 through 31 December 200512,210,80917,121,668
At least 30 days of continuous enrollment from the end of 1-year enrollment9,249,2112,961,598
Control cohort: patients without diabetes
    No medical claims for diabetes (250.xx) during the study period8,579,024670,187
    No claims for antidiabetes medication during study period8,521,49057,534
    Sex is unknown8,519,5581,932
    Any medical claims during the study period6,947,2991,572,259
Study cohort: type 2 diabetes
    Claim for type 2 diabetes or antidiabetic medication at any time from 1 January 1999 through 31 December 20051,337,081
    Claim for type 2 diabetes or antidiabetes medication during the continuous enrollment period640,504696,577
    Medical claim for type 2 diabetes (250.x0 or 250.x2) during the continuous enrollment period563,82776,677
    Claim for antidiabetes medication during the continuous enrollment period463,046100,781
    Medical claim for type 2 diabetes (250.x0 or 250.x2) AND a claim for an antidiabetes medication during 1 January 1999 through 31 December 2005386,36976,677
    Drop patients on insulin-only therapy AND claim for type 1 diabetes (250.x1 or 250.x3)352,63333,736
    Sex is known352,56964
Matching
    Pairs matched 1:1 by sex and age category352,569
    Pairs with available claims data337,06715,502