Table 2

The effects of aspirin on colorectal tumour development in smokers

SubanalysisNo. of subjects with (+) or without (−) colorectal tumourAdjusted OR (95% CI)
+Total
Current smoker
 Placebo group2619451
 Aspirin group1420343.45 (1.12 to 10.64), p=0.03
Non-smoker*
 Placebo group60541141
 Aspirin group82361180.37 (0.21 to 0.68), p=0.01
  • Adjusted OR, OR is adjusted by sex, age and the number of tumours prior to the trial.

  • *Non-smoker: never smoked and former smokers.