• Paul J Barr, Alistair James O'Malley, Maka Tsulukidze, Michael R Gionfriddo, Victor Montori, and Glyn Elwyn.
• The Dartmouth Institute for Health Policy and Clinical Practice, Lebanon, USA. Electronic address: Paul.J.Barr@dartmouth.edu.
• Patient Educ Couns. 2015 Aug 1; 98 (8): 970-6.

ObjectivesObserver OPTION(5) was designed as a more efficient version of OPTION(12), the most commonly used measure of shared decision making (SDM). The current paper assesses the psychometric properties of OPTION(5).MethodsTwo raters used OPTION(5) to rate recordings of clinical encounters from two previous patient decision aid (PDA) trials (n=201; n=110). A subsample was re-rated two weeks later. We assessed discriminative validity, inter-rater reliability, intra-rater reliability, and concurrent validity.ResultsOPTION(5) demonstrated discriminative validity, with increases in SDM between usual care and PDA arms. OPTION(5) also demonstrated concurrent validity with OPTION(12), r=0.61 (95%CI 0.54, 0.68) and intra-rater reliability, r=0.93 (0.83, 0.97). The mean difference in rater score was 8.89 (95% Credibility Interval, 7.5, 10.3), with intraclass correlation (ICC) of 0.67 (95% Credibility Interval, 0.51, 0.91) for the accuracy of rater scores and 0.70 (95% Credibility Interval, 0.56, 0.94) for the consistency of rater scores across encounters, indicating good inter-rater reliability. Raters reported lower cognitive burden when using OPTION(5) compared to OPTION(12).ConclusionsOPTION(5) is a brief, theoretically grounded observer measure of SDM with promising psychometric properties in this sample and low burden on raters.Practice ImplicationsOPTION(5) has potential to provide reliable, valid assessment of SDM in clinical encounters.Copyright © 2015 Elsevier Ireland Ltd. All rights reserved.

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