Table 2 Crohn’s Disease Activity Index (CDAI) [9]

1. Stool frequency (per day)

• Normal number of stools

0

• 2 more than normal

1

• 3–4 more than normal

2

• ≥ 5 more than normal

3

2. Rectal bleeding (indicate the most severe bleeding of the day)

• None

0

• Streaks of blood with stool in less than half of the cases

1

• Obvious blood with stools in most cases

2

• Blood alone passes

3

3. Endoscopic findings

• Normal mucosa or inactive disease

0

• Mild activity (erythema, decreased vascular pattern, mild friability)

1

• Moderate activity (marked erythema, lack of vascular pattern, friability, erosions)

2

• Severe activity (spontaneous bleeding, large ulcerations)

3

4. Physician’s global assessment

• Normal

0

• Mild disease

1

• Moderate disease

2

• Severe disease

3