Univariate analysis of potential demographic factors associated with colorectal neoplasia
| Variables | Number (%) | HR (95% CI) | P value |
| Family history of colorectal cancer | 48 (4.9) | 0.5 (0.2 to 1.5) | 0.2 |
| Male sex | 559 (56.6) | 0.9 (0.6 to 1.4) | 0.7 |
| Primary sclerosing cholangitis | 42 (4.3) | 3.5 (1.7 to 6.9) | <0.001 |
| Duration of UC at colonoscopy (year: median, IQR) | 19 (12–28) | 1.02 (0.99 to 1.04) | 0.2 |
| Age (year: median, IQR) | |||
| At colonoscopy | 52 (42–61) | 1.03 (1.01 to 1.05) | 0.001 |
| At UC onset | 30 (22–40) | 1.02 (1.01 to 1.04) | 0.01 |
| 5-aminosalicylate exposure (year) | |||
| <1 | 183 (18.5) | 1 | 0.6 |
| 1–10 | 448 (45.4) | 1.2 (0.7 to 2.0) | 0.5 |
| >10 | 356 (36.1) | 0.8 (0.5 to 1.4) | |
| Immunosuppressant exposure (year) | |||
| <1 | 631 (63.9) | 1 | 0.1 |
| 1–10 | 267 (27.1) | 1.4 (0.9 to 2.3) | 0.4 |
| >10 | 89 (9.0) | 1.3 (0.7 to 2.5) |
Statistically significant variables are highlighted in bold.