|  | n° | winter n°(%) | spring n°(%) | summer n°(%) | autumn n°(%) | Χ2 | p | Difference between subgroups | |
---|---|---|---|---|---|---|---|---|---|---|
Total of sample | Â | 26,848 | 6,831 (25.4) | 6,876 (25.6) | 6,249 (23.3) | 6,892 (25.7) | 42.88 | <0.001 | Â | Â |
Gender | Women | 10,053 | 2,483 (24.7) | 2,656 (26.4) | 2,381 (23.7) | 2,533 (25.2) | 15.59 | 0.002 | t = 10.10 | p = 0.022 |
 | Men | 16,795 | 4,348 (25.9) | 4,220 (25.1) | 3,868 (23.0) | 4,359 (26.0) | 37.58 | <0.001 |  |  |
Age subgroups | <65 yrs | 7,151 | 1,754 (24.5) | 1,807 (25.3) | 1,680 (23.5) | 1,910 (26.7) | 15.71 | 0.001 | t = 16.62 | p = 0.011 |
 | 65-74 yrs | 8,849 | 2,358 (26.6) | 2,208 (25.0) | 2,047 (23.1) | 2,236 (25.3) | 22.21 | <0.001 |  |  |
 | ≥ 75 yrs | 10,848 | 2,719 (25.1) | 2,861 (26.4) | 2,522 (23.2) | 2,746 (25.3) | 21.94 | <0.001 |  |  |
Final outcome | Fatal | 1,290 | 358 (27.8) | 326 (25.3) | 317 (24.6) | 289 (22.4) | 7.52 | n.s. | t = 9.51 | p = 0.03 |
 | Non fatal | 25,558 | 6,473 (25.3) | 6,550 (25.6) | 5,932 (23.2) | 6,603 (25.8) | 45.01 | <0.001 |  |  |
With hemorrhage | Â | 12,682 | 3,247 (25.6) | 3,172 (25.0) | 2,970 (23.4) | 3,293 (26.0) | 19.26 | <0.001 | Â | Â |
With perforation | Â | 2,541 | 596 (23.5) | 688 (27.1) | 593 (23.3) | 664 (26.1) | 10.92 | 0.013 | Â | Â |
Gastric ulcer | Total | 976 | 242 (24.8) | 242 (24.8) | 212 (21.7) | 280 (28.7) | 9.54 | 0.024 | Â | Â |
 | Acute | 734 | 181 (24.7) | 179 (24.4) | 164 (22.3) | 210 (28.6) | 6.07 | n.s. | t = 0.758 | p = n.s. |
 | Chronic | 242 | 61 (25.2) | 63 (26.0) | 48 (19.8) | 70 (28.9) | 4.18 | n.s. |  |  |
Duodenal ulcer | Total | 24,105 | 6,075 (25.2) | 6,180 (25.6) | 5,636 (23.4) | 6,214 (25.8) | 35.44 | <0.001 | Â | Â |
 | Acute | 12,180 | 3,038 (24.9) | 3,136 (25.7) | 2,866 (23.5) | 3,140 (25.8) | 16.22 | 0.001 | t = 30.37 | p < 0.001 |
 | Chronic | 7,415 | 1,594 (21.5) | 2,004 (27.0) | 1,814 (24.5) | 2,003 (27.0) | 61.47 | <0.001 |  |  |
Peptic ulcer, site unspecified | Total | 2,795 | 768 (27.5) | 711 (25.4) | 622 (22.3) | 694 (24.8) | 15.56 | 0.002 | Â | Â |
 | Acute | 359 | 91 (25.3) | 85 (23.7) | 86 (24.0) | 97 (27.0) | 1.04 | n.s. | t = 1.788 | p = n.s. |
 | Chronic | 2,383 | 628 (26.4) | 626 (26.3) | 536 (22.5) | 593 (24.9) | 9.3 | 0.026 |  |  |
Gastrojejunal ulcer | Â | 51 | 17 (33.3) | 13 (25.5) | 10 (19.6) | 11 (21.6) | 2.25 | n.s. | Â | Â |