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Classification of ulcerative colitis per Truelove and Witts criteria at admission
| Variables | Mild | Moderate | Severe |
|---|---|---|---|
| Stool frequency/day | ≤4 per day | 4–6 per day | ≥6 per day |
| Blood in stool | None or small | - | Present |
| Temperature | Apyrexial | Intermediate | >37.8 |
| Heart rate bpm | <90min/min | Intermediate | >90/min |
| Anemia (Hb=g/dL) | >11 | 10.5–11 | <10.5 |
| Erythrocite sedimentation rate (mm/hour) | <20 | 20–30 | >30mm/h |
