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Convergent and discriminant validity were evaluated using Spearman's rank correlations, while known\u2010groups validity was examined using analysis of variance. Cohen's kappa and distribution\u2010based methods were used to estimate agreement and MIDs respectively.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Robust convergent (\n                      <jats:italic>\u03c1<\/jats:italic>\n                      \u00a0=\u00a00.66\u20130.82, 95% confidence interval [CI] 0.54\u20130.86) and discriminant (\n                      <jats:italic>\u03c1<\/jats:italic>\n                      \u00a0=\u00a00.06\u20130.31, 95% CI \u22120.11 to 0.43) validity were found for all four mobility measures. Known\u2010groups validity was supported by significant mean differences across AMC subtypes (amyoplasia, distal arthrogryposis, central nervous system\/syndromic;\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.001). The measures also showed weak to good agreement in classifying mobility. A difference of one and two levels on the FMS and FAQ respectively, was found to be minimally important. For the PROMIS and WeeFIM, estimated MID values were 3.19 to 4.34 and 14.24 respectively.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Interpretation<\/jats:title>\n                    <jats:p>The robust construct validity, agreement, and MIDs provide clinicians and researchers with evidence\u2010based benchmarks for assessing mobility in children with AMC.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/dmcn.70036","type":"journal-article","created":{"date-parts":[[2025,10,22]],"date-time":"2025-10-22T19:14:49Z","timestamp":1761160489000},"page":"832-845","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Psychometric properties of functional mobility outcome measures in children with arthrogryposis multiplex 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