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Chiropractic & Manual Therapies
Published in: Chiropractic & Manual Therapies 1/2015

Open Access 01-12-2015 | Research

Exploring the construct validity of the Patient Perception Measure – Osteopathy (PPM-O) using classical test theory and Rasch analysis

Authors: Jane Mulcahy, Brett Vaughan

Published in: Chiropractic & Manual Therapies | Issue 1/2015

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Abstract

Background

Evaluation of patients’ experience of their osteopathic treatment has recently been investigated leading to the development of the Patient Perception Measure – Osteopathy (PPM-O). The aim of the study was to investigate the construct validity of the PPM-O.

Methods

Patients presenting to osteopathy student-led teaching clinics at two Australian universities were asked to complete two questionnaires after their treatment: a demographic questionnaire and the PPM-O. Confirmatory factor analysis (CFA) and Rasch analysis were used to investigate the construct validity of the PPM-O.

Results

Data from the present study did not fit the a-priori 6-domain structure in the CFA. Modifications to the 6-domain model were then made based on the CFA results, and this analysis identified two factors: 1) Education & Information (9 items); and 2) Cognition & Fatigue (6 items). These two factors were Rasch analysed individually. Two items were removed from the Cognition & Fatigue factor during the analysis. The two factors independently were unidimensional.

Conclusions

The study produced a 2-factor, 13-item questionnaire that assesses the patients’ perception of their osteopathic treatment using the items from a previous questionnaire. The results of the current study provide evidence for the construct validity of the PPM-O and the small number of items makes it feasible to implement into both clinical and research settings. Further research is now required to establish the measures’ validity in a variety of patient populations.
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Metadata
Title
Exploring the construct validity of the Patient Perception Measure – Osteopathy (PPM-O) using classical test theory and Rasch analysis
Authors
Jane Mulcahy
Brett Vaughan
Publication date
01-12-2015
Publisher
BioMed Central
Published in
Chiropractic & Manual Therapies / Issue 1/2015
Electronic ISSN: 2045-709X
DOI
https://doi.org/10.1186/s12998-015-0055-x

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