Background Differential item functioning (DIF) methods can be used to determine whether
different subgroups respond differently to particular items within a health-related quality of …

Study Design Prospective, longitudinal, observational cohort. Objectives Primary aims were
to determine (1) baseline prevalence of directional preference (DP) or no directional …

Background Plantar heel pain syndrome (PHPS) is a common foot disorder; however, there
is limited clinical evidence on which to base treatment. Repeated clinical observations …

Background Role functioning (RF) as a core construct of health-related quality of life
(HRQOL) comprises aspects of occupational and social roles relevant for patients in all …

Purpose Computerized adaptive test (CAT) methods, based on item response theory (IRT),
enable a patient-reported outcome instrument to be adapted to the individual patient while …

The purpose of this study was to investigate the construct validity of the Self-Efficacy/Social
Support for Activity for persons with Intellectual Disability (SE/SS-AID) scales developed by …

Objective To evaluate psychometric properties of a widely used patient experience survey.
Data Sources English‐language responses to the Clinician & Group Consumer Assessment …

Objective To improve measurement precision, the European Organisation for Research and
Treatment of Cancer (EORTC) Quality of Life Group is develo** an item bank for …

Purpose Patient-reported outcomes should ideally be adapted to the individual patient while
maintaining comparability of scores across patients. This is achievable using computerized …

Background The evaluation of the outcomes of total knee arthroplasty requires
measurement tools that are valid, reliable, and responsive to change. However, the …