Psychometric evaluation of a patient-reported outcome measure in pancreatic exocrine insufficiency (PEI)

Pancreatic exocrine insufficiency (PEI) is commonly caused by chronic pancreatitis (CP) or cystic fibrosis (CF). There are no PEI-specific patient-reported assessments of symptoms and impacts. The PEI Questionnaire (PEI-Q) was developed through qualitative research with PEI patients and expert clinical input. This study evaluated the psychometric properties of the PEI-Q. 162 PEI patients (CF = 71 and CP = 91), 62 diarrhoea-specific irritable...