| Smokers n = 106 | Non-smokers n = 124 | |
|---|---|---|
| Male:female | 51%:49% | 47%:53% |
| Age | 37 | 33 |
| Ethnicity – White:Black:Other | 81%:19%:0% | 80%:9%:11% |
| Crohn’s:Ulcerative colitis | 82%:18% | 72%:27% |
| Previous Surgery | 45% | 27% |
| Mean TPMT | 38.4 (median 35) | 34.1 (median 35) |
| Hepatotoxicity | 15.1% | 13.7% |
| Hypermethylation | 28.3% | 42.7% |