• C B Terwee, CrinsM H PMHPAmsterdam Rehabilitation Research Center | Reade, Amsterdam, The Netherlands., M Boers, de VetH C WHCWDepartment of Epidemiology and Biostatistics, Amsterdam Public Health Research Institute, VU University Medical Center, P.O. Box 7057, 1007 MB, Amsterdam, The Netherlands., and L D Roorda.
• Department of Epidemiology and Biostatistics, Amsterdam Public Health Research Institute, VU University Medical Center, P.O. Box 7057, 1007 MB, Amsterdam, The Netherlands. cb.terwee@vumc.nl.
• Qual Life Res. 2019 Jan 1; 28 (1): 211-220.

BackgroundThe Patient-Reported Outcomes Measurement Information System (PROMIS) item banks 'Ability to Participate in Social Roles and Activities' (35 items) and 'Satisfaction with Social Roles and Activities' (44 items) were developed to measure (satisfaction with) participation more efficiently and precisely than current instruments, by using Computerized Adaptive Testing (CAT). We validated these item banks in a Dutch general population.MethodsParticipants in an internet panel completed both item banks. Unidimensionality, local dependence, monotonicity, Graded Response Model item fit, Differential Item Functioning (DIF) for age, gender, education, region, ethnicity, and language (Dutch compared to US Social Supplement), and reliability were assessed.ResultsA representative Dutch sample of 1002 people participated. We found for the Ability to Participate and Satisfaction with Participation item banks, respectively, sufficient unidimensionality (CFI: 0.971, 0.960; TLI: 0.970, 0.958; RMSEA: 0.108, 0.108), no local dependence, sufficient monotonicity (H: 0.75, 0.73), good item fit (2 out of 35 items, 1 out of 44 items with S-X2p-value < 0.001). No DIF was found. We found a reliability of at least 0.90 with simulated CATs in 86% and 94% of the participants with on average 4.7 (range 2-12) and 4.3 (range 3-12) items, respectively.DiscussionThe PROMIS participation item banks showed sufficient psychometric properties in a general Dutch population and can be used as CAT. PROMIS CATs allow reliable and valid measurement of participation in an efficient and user-friendly way with limited administration time.

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