University of Washington Self-Efficacy Scale: A New Self-Efficacy Scale for People With Disabilities Dagmar Amtmann, PhD, Alyssa M. Bamer, MPH, Karon.

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University of Washington Self-Efficacy Scale: A New Self-Efficacy Scale for People With Disabilities Dagmar Amtmann, PhD, Alyssa M. Bamer, MPH, Karon F. Cook, PhD, Robert L. Askew, MPH, Vanessa K. Noonan, PhD, Jo Ann Brockway, PhD Archives of Physical Medicine and Rehabilitation Volume 93, Issue 10, Pages 1757-1765 (October 2012) DOI: 10.1016/j.apmr.2012.05.001 Copyright © 2012 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 1 A 2-panel IRT-based information graph of the 17-item and 6-item self-efficacy scales with reliability levels of 0.8 and 0.9 marked. The panel above the line that represents 0 information is the IRT-based instrument information function that shows precision at different levels of self-efficacy. The score measures with a precision sufficient for individual comparisons (ie, above 0.9 reliability) from about −3 theta (T score of 20) to about 1.8 theta (T score of 68) for the long form and −2.3 theta (T score of 28) to about 1 theta (T score of 60) for the 6-item short form. This means that the score based on the 6-item short form for individuals who score at 1 SD above the mean (T score of 60) or higher is not precise enough to differentiate higher levels of self-efficacy at the individual level. The second panel below the 0 information line is a histogram of the calibration sample that shows the distribution of the scores in the sample that was used to calibrate the scale items to document that the sample included individuals across the whole continuum of self-efficacy. Archives of Physical Medicine and Rehabilitation 2012 93, 1757-1765DOI: (10.1016/j.apmr.2012.05.001) Copyright © 2012 American Congress of Rehabilitation Medicine Terms and Conditions