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01-02-2014 | Uitgave 1/2014

Quality of Life Research 1/2014

Testing measurement invariance of the patient-reported outcomes measurement information system pain behaviors score between the US general population sample and a sample of individuals with chronic pain

Tijdschrift:
Quality of Life Research > Uitgave 1/2014
Auteurs:
Hyewon Chung, Jiseon Kim, Karon F. Cook, Robert L. Askew, Dennis A. Revicki, Dagmar Amtmann

Abstract

Purpose

In order to test the difference between group means, the construct measured must have the same meaning for all groups under investigation. This study examined the measurement invariance of responses to the patient-reported outcomes measurement information system (PROMIS) pain behavior (PB) item bank in two samples: the PROMIS calibration sample (Wave 1, N = 426) and a sample recruited from the American Chronic Pain Association (ACPA, N = 750). The ACPA data were collected to increase the number of participants with higher levels of pain.

Methods

Multi-group confirmatory factor analysis (MG-CFA) and two item response theory (IRT)-based differential item functioning (DIF) approaches were employed to evaluate the existence of measurement invariance.

Results

MG-CFA results supported metric invariance of the PROMIS–PB, indicating unstandardized factor loadings with equal across samples. DIF analyses revealed that impact of 6 DIF items was negligible.

Conclusions

Based on the results of both MG-CFA and IRT-based DIF approaches, we recommend retaining the original parameter estimates obtained from the combined samples based on the results of MG-CFA.

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