Objectives To compare the construct validity, including discrimination between known groups, of three pain and three morning stiffness (MS) measurement instruments. Methods Patients with radiographic ...

Objectives The Disease Activity index for Psoriatic Arthritis (DAPSA) was developed to assess disease activity in patients with psoriatic arthritis (PsA). A modified version, DAPSA28, uses 28 joints ...

Test validity lies at the core of educational and psychological testing, but there are controversies about what test validity is and how test validation should proceed. This paper develops a taxonomy ...

Objective This study evaluates the intra-rater and inter-rater reliability of the MyotonPRO and its construct validity for the assessment of Achilles tendon stiffness. Design Reliability and construct ...

Objectives Patient experience questionnaires have been criticised owing to the lack of supporting psychometric evidence. The objective of this study was to describe the development and psychometric ...

Introduction In high-income countries, the self-rated health (SRH) item is used in health surveys to capture the population’s general health because of its simplicity and satisfactory validity and ...