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Localization of perforated peptic ulcer
| Period | Duodenal ulcer n (%) | Stomach ulcer n (%) | Together n |
|---|---|---|---|
| I (1962–1976) | 227 (87.6) | 21 (12.4)a | 259 |
| II (1977–1991) | 249 (86.5) | 39 (13.5)b | 288 |
| III (1992–2006) | 300 (89.8) | 34 (10.2)c | 334 |
| I + II + III | 776 (88.1) | 105 (11.9) | 881 |
a/b, a/c, and b/c differences without statistical significance
