Table 1.
Basic characteristics among case patients with acute pancreatitis and matched control persons
| Exposure | Controls | Cases |
|---|---|---|
| N (%)* | N (%)* | |
| Total | 61,637 (100) | 6,161 (100) |
| Calendar year | ||
| 2006 | 19,963 (32) | 1,996 (32) |
| 2007 | 20,728 (34) | 2,071 (34) |
| 2008 | 20,946 (34) | 2,094 (34) |
| Sex | ||
| Male | 33,892 (55) | 3,387 (55) |
| Female | 27,745 (45) | 2,774 (45) |
| Age | ||
| 40–49 | 10,562 (17) | 1,055 (17) |
| 50–59 | 13,978 (23) | 1,397 (23) |
| 60–69 | 16,590 (27) | 1,659 (27) |
| 70–79 | 13,908 (23) | 1,391 (23) |
| 80–84 | 6,599 (11) | 659 (11) |
| Education level | ||
| Elementary school | 21,896 (36) | 2,464 (40) |
| Secondary school | 24,016 (39) | 2,455 (40) |
| University studies | 14,769 (24) | 1,099 (18) |
| Missing data | 956 (2) | 143 (2) |
| Alcohol related disease | 1,549 (3) | 682 (11) |
| Gallstone disease | 2,595 (4) | 2,246 (36) |
| Chronic obstructive pulmonary disease | 1,328 (2) | 326 (5) |
| Number of distinct medications | ||
| 0–1 | 25,373 (41) | 1,468 (24) |
| 2–4 | 16,953 (28) | 1,665 (27) |
| 5–9 | 13,656 (22) | 1,851 (30) |
| 10–14 | 4,252 (7) | 781 (13) |
| ≥ 15 | 1,403 (2) | 396 (6) |
*Percentages were rounded; hence the sum could be more or less than 100