• Kirstine Amris, Eva Ejlersen Wæhrens, Anders Stockmarr, Henning Bliddal, and Bente Danneskiold-Samsøe.
• The Parker Institute, Department of Rheumatology, Copenhagen University Hospital Bispebjerg and Frederiksberg , 2000 Frederiksberg, Denmark. kirstine.amris@regionh.dk, stine.amris@mail.dk.
• J Rehabil Med. 2014 Nov 1;46(10):1014-21.

ObjectiveTo evaluate the relationships between key outcome variables, classified according to the International Classification of Functioning, Disability and Health (ICF), and observed and self-reported functional ability in patients with chronic widespread pain.DesignCross-sectional with systematic data collection in a clinical setting.SubjectsA total of 257 consecutively enrolled women with chronic widespread pain.MethodsMultidimensional assessment using self-report and observation-based assessment tools identified to cover ICF categories included in the brief ICF Core Set for chronic widespread pain.ResultsRelationships between ICF variables and observed functional ability measured with the Assessment of Motor and Process Skills (AMPS) were few. Out of 36 relationships analysed, only 4 ICF variables showed a moderate correlation with the AMPS motor ability measure. A moderate to strong correlation between numerous ICF variables and self-reported functioning was noted. Multivariate regression modelling supported significant contributions from pain and psychosocial variables to the variability in self-reported functional ability, but not to the variability in AMPS ability measures.ConclusionObservation-based assessment of functional ability in patients with chronic widespread pain is less influenced by pain and psychosocial factors than are self-reported evaluations. Valid observation-based assessment tools, such as the AMPS, should be included in clinical evaluation and future research addressing functional outcomes in this patient population.

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