The rehabilitation measure is based on the biopsychosocial ICF model of the WHO. A multidisciplinary team of therapists looks after the patients during their stay in rehabilitation. Taking into account the physical and psychological condition of the patients, an individual therapy plan is created that is tailored to their needs.

Faecal calprotectin is a biochemical measurement of the protein calprotectin in the stool. Elevated faecal calprotectin indicates the migration of neutrophils to the intestinal mucosa, which occurs during intestinal inflammation, including inflammation caused by inflammatory bowel disease.

The Ced Disk measures IBD-related impairments in different dimensions i.e., abdominal pain, bowel control, interpersonal interactions, education and work, sleep, energy, emotions, body image, sexuality, joint pain (Min. = 0, Max. = 10). Lower values indicate less impairments in the respective dimensions.

The EQ-5D-5L is a general instrument for measuring patient-reported outcomes (PROs), which can be used to assess the quality of life of patients on different dimensions (mobility, self-care, usual activities, pain/discomfort) on a 5-level scale (Min. = 0, Max. = 5). Lower values indicate less impairments in the respective dimensions.

Moreover, the EQ-5D-5L assesses the patient's self-rated health on a 100 point visual analog scale (Min. = 0, Max. = 100). Lower values indicate less positive ratings of health.

The Patient Health Questionnaire-4 (PHQ-4) operationalizes core criteria for anxiety and depression on a 4 point likert scale (Min. = 0, Max = 4). Lower values indicate less impairments.

The Work Ability Index (WAI) is an instrument for assessing work ability. (Min. = 7, Max = 49). Lower values indicate less subjective work ability.