Towards standardization of fatigue measurement: Psychometric properties and reference values of the PROMIS Fatigue item bank in the Dutch general population

Background There is little consensus on how to measure fatigue. Objectives To standardize the measurement of fatigue across populations, we aimed to assess the psychometric properties of the PROMIS Fatigue item bank in the Dutch general population and obtain reference values. Methods A sample of 1006 people participating in an internet panel completed the full v1.0 PROMIS Fatigue item bank (95 items). Structural validity (item response theory (IRT) assumptions and IRT model fit), measurement invariance/cross-cultural validity (absence of differential items functioning (DIF) for demographic var... Mehr ...