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| Variables | aOR* | 95% CI |
| Aspirin user Ever | 1.01 | 0.89–1.14 |
| Aspirin user, > 1 year | 0.91 | 0.82–1.01 |
| Aspirin user, > 5 year | 0.93 | 0.84–1.01 |
| Aspirin user, > 10 year | 0.95 | 0.65–1.38 |
aOR, adjusted odds ratio.
*Propensity score matching by age, gender, smoking, opium use, diabetes mellitus, residence and family history of any cancer in first-degree relatives.
