The development of a short measure of physical function for knee OA KOOS-Physical Function Shortform (KOOS-PS) – an OARSI/OMERACT initiative A.V. Perruccio, M.H.Sc., L. Stefan Lohmander, M.D., Ph.D., Dr., M. Canizares, M.Sc., A. Tennant, Ph.D., Dr., G.A. Hawker, M.D., M.Sc., Dr., P.G. Conaghan, M.B.B.S., Ph.D., F.R.A.C.P., F.R.C.P., E.M. Roos, P.T., Ph.D., Dr., J.M. Jordan, M.D., M.P.H., Dr., J.-F. Maillefert, M.D., Ph.D., Dr., M. Dougados, M.D., Dr., A.M. Davis, Ph.D., Dr. Osteoarthritis and Cartilage Volume 16, Issue 5, Pages 542-550 (May 2008) DOI: 10.1016/j.joca.2007.12.014 Copyright © 2008 Osteoarthritis Research Society International Terms and Conditions
Fig. 1 Item characteristic curves for item rise from sitting by age (A), item twisting/pivoting on injured knee by gender (B) and item rising from bed by country (C). Osteoarthritis and Cartilage 2008 16, 542-550DOI: (10.1016/j.joca.2007.12.014) Copyright © 2008 Osteoarthritis Research Society International Terms and Conditions
Fig. 2 Person-item threshold distribution, total sample – final model with seven items. Osteoarthritis and Cartilage 2008 16, 542-550DOI: (10.1016/j.joca.2007.12.014) Copyright © 2008 Osteoarthritis Research Society International Terms and Conditions
Fig. 3 Distribution of RPSs (scaled 0–100) by sample type. Osteoarthritis and Cartilage 2008 16, 542-550DOI: (10.1016/j.joca.2007.12.014) Copyright © 2008 Osteoarthritis Research Society International Terms and Conditions
Fig. 4 Scatter plot of raw summed scores and RPSs for final seven items and predicted curve from cubic model (n=1154). Osteoarthritis and Cartilage 2008 16, 542-550DOI: (10.1016/j.joca.2007.12.014) Copyright © 2008 Osteoarthritis Research Society International Terms and Conditions
Fig. 5 Scatter plot of observed and predicted RPSs. Osteoarthritis and Cartilage 2008 16, 542-550DOI: (10.1016/j.joca.2007.12.014) Copyright © 2008 Osteoarthritis Research Society International Terms and Conditions
Osteoarthritis and Cartilage 2008 16, 542-550DOI: (10. 1016/j. joca Copyright © 2008 Osteoarthritis Research Society International Terms and Conditions