• Crins Martine H P MHP Amsterdam Rehabilitation Research Center|Reade, Doctor Jan van Breemenstraat 2, Amsterdam 1056 AB, The Netherlands. Electronic address: m.crins@read, Caroline B Terwee, Thomas Klausch, Niels Smits, de Vet Henrica C W HCW Department of Epidemiology and Biostatistics, The EMGO Institute for Health and Care Research, VU University Medical Center, Van der Boechorststraa, Rene Westhovens, David Cella, Karon F Cook, Dennis A Revicki, Jaap van Leeuwen, Maarten Boers, Joost Dekker, and Leo D Roorda.
• Amsterdam Rehabilitation Research Center|Reade, Doctor Jan van Breemenstraat 2, Amsterdam 1056 AB, The Netherlands. Electronic address: m.crins@reade.nl.
• J Clin Epidemiol. 2017 Jul 1; 87: 47-58.

ObjectiveThe objective of this study was to assess the psychometric properties of the Dutch-Flemish Patient-Reported Outcomes Measurement Information System (PROMIS) Physical Function item bank in Dutch patients with chronic pain.Study Design And SettingA bank of 121 items was administered to 1,247 Dutch patients with chronic pain. Unidimensionality was assessed by fitting a one-factor confirmatory factor analysis and evaluating resulting fit statistics. Items were calibrated with the graded response model and its fit was evaluated. Cross-cultural validity was assessed by testing items for differential item functioning (DIF) based on language (Dutch vs. English). Construct validity was evaluated by calculation correlations between scores on the Dutch-Flemish PROMIS Physical Function measure and scores on generic and disease-specific measures.ResultsResults supported the Dutch-Flemish PROMIS Physical Function item bank's unidimensionality (Comparative Fit Index = 0.976, Tucker Lewis Index = 0.976) and model fit. Item thresholds targeted a wide range of physical function construct (threshold-parameters range: -4.2 to 5.6). Cross-cultural validity was good as four items only showed DIF for language and their impact on item scores was minimal. Physical Function scores were strongly associated with scores on all other measures (all correlations ≤ -0.60 as expected).ConclusionThe Dutch-Flemish PROMIS Physical Function item bank exhibited good psychometric properties. Development of a computer adaptive test based on the large bank is warranted.Copyright © 2017 Elsevier Inc. All rights reserved.

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