Differential Item Functioning

Using subdomain-specific item sets affected PROMIS physical function scores differently in cardiology and rheumatology patients

Objectives: The Patient-Reported Outcomes Measurement Information System (PROMIS) physical function (PF) item bank has been developed to standardize patient-reported PF across medical fields. However, evidence of scoring equivalence across cardiology …

Measurement invariance and general population reference values of the PROMIS Profile 29 in the UK, France and Germany

**Purpose:** Comparability of patient-reported outcome measures over different languages is essential to allow cross-national research. We investigate the comparability of the PROMIS Profile 29, a generic health-related quality of life measure, in …

Language-related Differential Item Functioning between English and German PROMIS Depression Items is negligible

To investigate differential item functioning (DIF) of PROMIS Depression items between US and German samples we compared data from the US PROMIS calibration sample (n = 780), a German general population survey (n = 2,500) and a German clinical sample …