Abstract
Introduction
To help researchers in multiple sclerosis (MS) take advantage of the measurement properties of the PROMIS Pain Interference instrument while maintaining continuity with previous research, we developed and tested a crosswalk table to transform Brief Pain Inventory pain interference scale (BPI-PI) scores to PROMIS-PI short form (PROMIS-PI SF) scores.
Methods
The BPI-PI and the PROMIS-PI SF were administered in two studies that included persons with MS. One sample of 369 participants served as a developmental calibration sample, and a separate sample of 360 served as a validation sample. The crosswalk development included dimensionality assessment, item-level parameter estimation, and assessment of accuracy. BPI-PI and PROMIS-PI T scores were obtained from participants’ item responses, and using the crosswalk table, PROMIS-PI T scores were derived from responses to the BPI-PI items. Differences between observed and crosswalked T scores were compared in both samples.
Results
For BPI-PI summary scores ranging from 0 to 10, corresponding T scores ranged from 38.6 to 81.2. The mean difference between observed and crosswalked T scores was 0.51 (SD = 3.9) in the calibration sample and −1.47 (SD = 4.2) in the validation sample. Approximately 80 % of crosswalked scores in the calibration sample were within four score points of the observed PROMIS-PI SF scores, and 70 % were within four points in the validation sample. In both samples, the largest differences were at lower levels of the pain interference continuum.
Conclusions
Crosswalked pain interference scores adequately approximated observed PROMIS-PI SF scores in both the calibration and validation samples. MS researchers and clinicians interested in adopting the PROMIS instruments can use this table to transform BPI-PI scores to enable comparisons with other studies and to maintain continuity with previous research.
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Acknowledgments
The contents of this manuscript were developed under grants from the Department of Education, National Institute on Disability and Rehabilitation Research (NIDRR) grant numbers H133B080024 and H133B031129. However, these contents do not necessarily represent the policy of the Department of Education, and one should not assume endorsement by the federal government. This work was also funded by the National Institutes of Health through the NIH Roadmap for Medical Research, Grant 5U01AR052171-03, to University of Washington. Information on the “Dynamic Assessment of Patient-Reported Chronic Disease Outcomes” can be found at http://nihroadmap.nih.gov/clinicalresearch/index.asp.
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Askew, R.L., Kim, J., Chung, H. et al. Development of a crosswalk for pain interference measured by the BPI and PROMIS pain interference short form. Qual Life Res 22, 2769–2776 (2013). https://doi.org/10.1007/s11136-013-0398-5
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DOI: https://doi.org/10.1007/s11136-013-0398-5