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

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.

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

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

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.