Table 1.

Prospective codification of one individual in a calendar year

Activity and treatment	N
Disease activity
Quiescent (no symptoms)	0
Minor symptoms without flare	1
Mild symptoms	2
Flare-up or chronic active disease	3
CD-related hospitalisation	4
Abdominal surgery for active CD or complication	5
Maximal treatment received during the year
No treatment for CD	0
5-amino-salicylates or antibiotics for CD	1
Low dose steroids (<10 mg Prednisone per day)	2
Steroids	3
Immunosuppressants	4
Anti-TNF agents	5

CD, Crohn's disease; TNF, tumour necrosis factor.