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01-04-2013 | Brief Communication | Uitgave 3/2013

Quality of Life Research 3/2013

Psychometric assessment of the patient activation measure short form (PAM-13) in rural settings

Tijdschrift:
Quality of Life Research > Uitgave 3/2013
Auteurs:
Man Hung, Marjorie Carter, Candace Hayden, Rhonda Dzierzon, Jose Morales, Laverne Snow, Jorie Butler, Kim Bateman, Matthew Samore

Abstract

Purpose

The patient activation measure short form (PAM-13) assesses patients’ self-reported health management skills, knowledge, confidence, and motivation. We used item response theory to evaluate the psychometric properties of the PAM-13 utilized in rural settings.

Methods

A Rasch partial credit model analysis was conducted on the PAM-13 instrument using a sample of 812 rural patients recruited by providers and our research staff. Specially, we examined dimensionality, item fit, and quality of measures, category response curves, and item differential functioning. Convergent and divergent validities were also examined.

Findings

The PAM-13 instrument has excellent convergent and divergent validities. It is fairly unidimensional, and all items fit the Rasch model well. It has relatively high person and item reliability indices. Majority of the items were free of item differential functioning. There were, however, some issues with ceiling effects. Additionally, there was a lack of responses for category one across all items.

Conclusions

Patient activation measure short form (PAM-13) performs well in some areas, but not all. In general, more items need to be added to cover the upper end of the trait. The four response categories of PAM-13 should be collapsed into three.

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