Development of a Crosswalk for Pain Interference Measured by the BPI and PROMIS Pain Interference Short Form

TitleDevelopment of a Crosswalk for Pain Interference Measured by the BPI and PROMIS Pain Interference Short Form
Publication TypeJournal Article
AuthorsAskew RL, Kim J, Chung H, Cook KF, Johnson KL, Amtmann D
JournalQuality of life research
Start Page2769
Date Published12/2013

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) scores to PROMIS-PI short form (PROMIS-PI SF) scores.

Methods: The BPI 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 separate sample of 360 served as a validation sample. The crosswalk development included dimensionality assessment, item-level parameter estimation, and assessment of accuracy. BPI 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 items. Differences between observed and crosswalked T-scores were compared in both samples.

Results: For BPI 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 4 score points of the observed PROMIS-PI SF scores, and 70% were within 4 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. Researchers and clinicians interested in adopting the PROMIS instruments can use this table to transform BPI scores to enable comparisons with other studies and to maintain continuity with previous research.