Measurement invariance of the PROMIS pain interference item bank across community and clinical samples.

TitleMeasurement invariance of the PROMIS pain interference item bank across community and clinical samples.
Publication TypeJournal Article
Year of Publication2013
AuthorsKim J, Chung H, Amtmann D, Revicki DA, Cook KF
JournalQual Life Res
Volume22
Issue3
Pagination501-7
Date Published2013 Apr
ISSN1573-2649
KeywordsActivities of Daily Living, Adolescent, Adult, Aged, Aged, 80 and over, Data Collection, Data Interpretation, Statistical, Disability Evaluation, Ethnic Groups, Factor Analysis, Statistical, Female, Health Status, Humans, Information Systems, Male, Middle Aged, Outcome Assessment (Health Care), Pain, Pain Measurement, Psychometrics, Quality of Life, Reproducibility of Results, Young Adult
Abstract

PURPOSE: This study examined the measurement invariance of responses to the patient-reported outcomes measurement information system (PROMIS) pain interference (PI) item bank. The original PROMIS calibration sample (Wave I) was augmented with a sample of persons recruited from the American Chronic Pain Association (ACPA) to increase the number of participants reporting higher levels of pain. Establishing measurement invariance of an item bank is essential for the valid interpretation of group differences in the latent concept being measured.

METHODS: Multi-group confirmatory factor analysis (MG-CFA) was used to evaluate successive levels of measurement invariance: configural, metric, and scalar invariance.

RESULTS: Support was found for configural and metric invariance of the PROMIS-PI, but not for scalar invariance.

CONCLUSIONS AND RECOMMENDATIONS: Based on our results of MG-CFA, we recommend retaining the original parameter estimates obtained by combining the community sample of Wave I and ACPA participants. Future studies should extend this study by examining measurement equivalence in an item response theory framework such as differential item functioning analysis.

DOI10.1007/s11136-012-0191-x
Alternate JournalQual Life Res
PubMed ID22552604