Table 6.

Perianal Crohn’s disease activity index

Categories affected by fistulas	Score
Discharge
No discharge	0
Minimal mucous discharge	1
Moderate mucous or purulent discharge	2
Substantial discharge	3
Gross fecal soiling	4
Pain/restriction of activities
No activity restriction	0
Mild discomfort, no restriction	1
Moderate discomfort, some limitation of activities	2
Marked discomfort, marked limitation	3
Severe pain, severe limitation	4
Restriction of sexual activity
No restriction sexual activity	0
Slight restriction sexual activity	1
Moderate limitation sexual activity	2
Marked limitation sexual activity	3
Unable to engage in sexual activity	4
Type of perineal disease
No perineal disease/skin tags	0
Anal fissure or mucosal tear	1
< 3 Perianal fistulae	2
≥ Perianal fistulae	3
Anal sphincter ulceration or fistulae with significant undermining of skin	4
Degree of induration
No induration	0
Minimal induration	1
Moderate induration	2
Substantial induration	3
Gross fluctuance/abscess	4

Modified from Irvine[151].