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 remaining | Patients removed | |
|---|---|---|
| Enrolled in health plan at any time from 1 January 1999 through 31 December 2005 | 29,332,477 | — |
| Total population aged ≥18 years as of 1 January 2000, continuous enrollment for ≥1 year from 1 January 1999 through 31 December 2005 | 12,210,809 | 17,121,668 |
| At least 30 days of continuous enrollment from the end of 1-year enrollment | 9,249,211 | 2,961,598 |
| Control cohort: patients without diabetes | ||
| No medical claims for diabetes (250.xx) during the study period | 8,579,024 | 670,187 |
| No claims for antidiabetes medication during study period | 8,521,490 | 57,534 |
| Sex is unknown | 8,519,558 | 1,932 |
| Any medical claims during the study period | 6,947,299 | 1,572,259 |
| Study cohort: type 2 diabetes | ||
| Claim for type 2 diabetes or antidiabetic medication at any time from 1 January 1999 through 31 December 2005 | 1,337,081 | — |
| Claim for type 2 diabetes or antidiabetes medication during the continuous enrollment period | 640,504 | 696,577 |
| Medical claim for type 2 diabetes (250.x0 or 250.x2) during the continuous enrollment period | 563,827 | 76,677 |
| Claim for antidiabetes medication during the continuous enrollment period | 463,046 | 100,781 |
| 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 2005 | 386,369 | 76,677 |
| Drop patients on insulin-only therapy AND claim for type 1 diabetes (250.x1 or 250.x3) | 352,633 | 33,736 |
| Sex is known | 352,569 | 64 |
| Matching | ||
| Pairs matched 1:1 by sex and age category | 352,569 | — |
| Pairs with available claims data | 337,067 | 15,502 |