Towards standardized patient reported physical function outcome reporting: linking ten commonly used questionnaires to a common metric

Outcomes obtained using different physical function patient reported outcome measures (PROMs) are difficult to compare. To facilitate standardization of physical function outcome measurement and reporting we developed an item response theory (IRT) based standardized physical function score metric for ten commonly used physical function PROMs. Data of a total of 16,386 respondents from representative cohorts of patients with rheumatic diseases as...