Improved responsiveness and reduced sample size requirements of PROMIS physical function scales with item response theory

James F. Fries(Arthritis and Rheumatism Associates), Bonnie Bruce(San Jose State University), Matthias Rose(Humboldt-Universität zu Berlin), Eswar Krishnan(University of Pittsburgh), Bharathi Lingala(Stanford University)
Arthritis Research & Therapy
September 14, 2011
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