Table 2. Aspirin or NSAIDs use and patient and tumour characteristics.
| Aspirin or NSAIDs use | ||||
|---|---|---|---|---|
| None | Prediagnosis and postdiagnosis | Only postdiagnosis | P -value | |
| Colon cancer | ||||
| Sex | ||||
| Male | 389 (52.0) | 707 (53.8) | 383 (52.5) | 0.02 |
| Female | 359 (48.0) | 608 (46.2) | 347 (47.5) | |
| Age | ||||
| <65 years | 237 (31.7) | 451 (34.3) | 292 (40.0) | <0.001 |
| 65–74 years | 215 (28.7) | 421 (32.0) | 246 (33.7) | |
| ⩾75 years | 296 (39.6) | 443 (33.7) | 192 (26.3) | |
| Grade | ||||
| I | 87 (11.6) | 176 (13.4) | 96 (13.2) | <0.001 |
| II | 436 (58.3) | 772 (58.7) | 443 (60.7) | |
| III | 127 (17.0) | 229 (17.4) | 116 (15.9) | |
| Unknown | 98 (13.1) | 138 (10.5) | 75 (10.3) | |
| Stage | ||||
| I | 111 (14.8) | 225 (17.1) | 131 (17.9) | <0.001 |
| II | 274 (36.6) | 476 (36.2) | 271 (37.1) | |
| III | 170 (22.7) | 359 (27.3) | 201 (27.5) | |
| IV | 150 (20.1) | 208 (15.8) | 109 (14.9) | |
| Unknown | 43 (5.7) | 47 (3.6) | 18 (2.5) | |
| Rectal cancer | ||||
| Sex | ||||
| Male | 284 (66.4) | 460 (59.7) | 311 (63.6) | 0.1 |
| Female | 144 (33.6) | 311 (40.3) | 178 (36.4) | |
| Age | ||||
| <65 years | 170 (39.7) | 334 (43.3) | 261 (53.4) | <0.001 |
| 65–74 years | 125 (29.2) | 252 (32.7) | 148 (30.3) | |
| ⩾75 years | 133 (31.1) | 185 (23.0) | 80 (16.3) | |
| Grade | ||||
| I | 37 (8.6) | 72 (9.3) | 34 (6.9) | 0.002 |
| II | 240 (56.1) | 401 (52.0) | 288 (58.9) | |
| III | 46 (10.8) | 87 (11.3) | 77 (15.8) | |
| Unknown | 105 (24.5) | 211 (27.4) | 90 (18.4) | |
| Stage | ||||
| I | 112 (26.2) | 252 (32.7) | 147 (30.1) | 0.1 |
| II | 106 (24.8) | 176 (22.8) | 116 (23.7) | |
| III | 111 (25.9) | 185 (24.0) | 137 (28.0) | |
| IV | 70 (16.4) | 117 (15.2) | 68 (13.9) | |
| Unknown | 29 (6.8) | 41 (5.3) | 21 (4.3) | |
Abbreviation: NSAID=non-steroid anti-inflammatory drug.