Table 1 Components of the modified Mayo score [20]

Stool frequency

 0: Normal

 1: 1–2 stools/day more than normal

 2: 3–4 stools/day more than normal

 3: >  4 stools/day more than normal

Rectal bleeding^a

 0: None

 1: Visible blood with stool less than half the time

 2: Visible blood with stool half of the time or more

 3: Passing of blood alone

Mucosal appearance at endoscopy^b

 0: Normal or inactive disease

 1: Mild disease (erythema, decreased vascular pattern, mild mucosal friability

 2: Moderate disease (marked erythema, absent vascular pattern, friability, erosions)

 3: Severe disease (spontaneous bleeding, ulceration)

Physician rating of disease activity

 0: Normal

 1: Mild

 2: Moderate

 3: Severe