Email updates

Keep up to date with the latest news and content from Arthritis Research & Therapy and BioMed Central.

Open Access Research article

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

James F Fries*, Eswar Krishnan, Matthias Rose, Bharathi Lingala and Bonnie Bruce

Arthritis Research & Therapy 2011, 13:R147  doi:10.1186/ar3461

Article Metrics

3479
Total accesses


3
BioMed Central citations

Article metric FAQ

Accesses  

  • Last 30 days: 96 accesses
  • Last 365 days: 1112 accesses
  • All time: 3479 accesses

These numbers are accesses on BioMed Central websites only, and an underestimate of total usage. More information