Calibration of the Activity Inventory Item Bank: A Patient-Reported Outcome Measurement Instrument for Low Vision Rehabilitation.

Translational Vision Science & Technology
Micaela GobeilleRobert Massof

Abstract

To provide calibrated item measures and rating category thresholds for the Activity Inventory (AI), an adaptive visual function questionnaire, from difficulty ratings obtained from a large sample of new low vision patients at pre-rehabilitation baseline. Baseline AI (510 items) rating scale data from five previous low vision rehabilitation outcome studies (n = 3623) were combined, and the method of successive dichotomizations was used to estimate calibrated item measures and rating category thresholds. Infit statistics were analyzed to evaluate the fit of the data to the model. Factor analysis was applied to person measures estimated from different subsets of items (e.g., functional domains such as reading, mobility) to evaluate differential person functioning. Estimated item measures were well targeted to the low vision patient population. The distribution of infit statistics confirmed the validity of the estimated measures and the two-factor structure previously observed for the AI. Our calibrated item measures and rating category thresholds enable researchers to estimate changes in visual ability from low vision rehabilitation on the same scale, facilitating comparisons between studies. The work described in this paper provi...Continue Reading

References

May 17, 2005·Archives of Physical Medicine and Rehabilitation·Robert W MassofCathy Epstein
May 17, 2005·Archives of Physical Medicine and Rehabilitation·Robert W MassofCathy Epstein
Dec 1, 1931·Proceedings of the National Academy of Sciences of the United States of America·E B Wilson, M M Hilferty
Aug 19, 2007·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Robert W MassofG David Barnett
Jul 23, 2013·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Robert W Massof, Joan A Stelmack
Jul 31, 2014·JAMA Ophthalmology·Judith E GoldsteinUNKNOWN Low Vision Research Network Study Group
Apr 10, 2015·JAMA Ophthalmology·Judith E GoldsteinUNKNOWN Low Vision Research Network Study Group
Mar 9, 2017·Investigative Ophthalmology & Visual Science·Ashley D DeemerCatherine V Piersol
Mar 6, 2019·Translational Vision Science & Technology·Ashley D DeemerRobert W Massof

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Software Mentioned

R Foundation for Statistical Computing
Winsteps
R package msd

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