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Arch Phys Med Rehabil. 2012 Jul;93(7):1289-91. doi: 10.1016/j.apmr.2011.11.022. Epub 2012 Mar 2.

Six patient-reported outcome measurement information system short form measures have negligible age- or diagnosis-related differential item functioning in individuals with disabilities.

Author information

  • 1Department of Medical Social Sciences, Northwestern University, Chicago, IL. Rodney.lipishan@albertahealthservices.ca

Abstract

OBJECTIVE:

To evaluate the measurement invariance of 6 self-report measures selected for an ongoing longitudinal study of individuals with spinal cord injury, muscular dystrophy, postpolio syndrome, and multiple sclerosis.

DESIGN:

Participants completed and returned by mail surveys that included the targeted self-report measures. Ordinal logistic regressions methods were applied to evaluate items for differential item functioning (DIF) by diagnosis and age range.

SETTING:

Community.

PARTICIPANTS:

Participants (N=2479) who had 1 of the 4 target diagnoses.

INTERVENTIONS:

None.

MAIN OUTCOME MEASURES:

Six short-form measures from the Patient-Reported Outcome Measurement Information System (PROMIS) were administered to participants to measure fatigue, pain interference, satisfaction with social roles, sleep disturbance, sleep-related impairment, and depression.

RESULTS:

One item of 1 measure (fatigue) exhibited DIF by diagnosis based on a published standard for meaningful DIF. However, scores corrected for this DIF were highly correlated with uncorrected scores (r>.999). No DIF by age range was found for any of the measures.

CONCLUSIONS:

Study findings support the use of the selected PROMIS short forms for comparing symptoms and quality of life indicators across different diagnoses and age ranges.

Copyright © 2012 American Congress of Rehabilitation Medicine. Published by Elsevier Inc. All rights reserved.

PMID:
22386213
[PubMed - indexed for MEDLINE]
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