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Gender differences in perforated duodenal ulcer
| Period | Male patients n (%) | Female patients n (%) | Together n |
|---|---|---|---|
| I (1962–1976) | 199 (87.7) | 28 (12.3)a | 227 |
| II (1977–1991) | 200 (80.3) | 49 (19.7)b | 249 |
| III (1992–2006) | 203 (67.7) | 97 (32.3)c | 300 |
| I + II + III | 602 (77.6) | 174 (22.4) | 776 |
a/b difference with statistical significance (P < 0.05)
a/c and b/c differences with statistical significance (P < 0.01)
