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Factor and reliability analysis of a brief scale to measure motivation to change lifestyle for dementia risk reduction in the UK: The MOCHAD-10

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Oliveira, D, Aubeeluck, A, Stupple, E, Kim, S ORCID: 0000-0003-4869-9255 and Orrell, M 2019 , 'Factor and reliability analysis of a brief scale to measure motivation to change lifestyle for dementia risk reduction in the UK: The MOCHAD-10' , Health and Quality of Life Outcomes, vol. 17, no. 11 , pp. 1-7 , doi: 10.1186/s12955-019-1143-8.

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Abstract

Background: Modifying lifestyle risk factors for dementia is a public health priority. Motivation for change isintegral to the modification of health-related risk behaviours. This study investigates the psychometric properties ofthe previously validated tool entitled ‘Motivation to Change Lifestyle and Health Behaviours for Dementia RiskReduction Scale’ (MCLHB-DRR) for use in the UK.Methods: A sample of 3,948 individuals aged 50 and over completed the 27-item MCLHB-DRR online. Thepsychometric properties of the scale were explored via Exploratory Principal Axis Factoring (PAF) with Obliminrotation. Confirmatory Factor Analysis (CFA) was used to confirm the factor structure using chi-square (χ2), thegoodness-of-fit index (GFI), the comparative fit index (CFI), the root mean square error of approximation (RMSEA)and Root Mean Square Residual (RMR) as fit indices to evaluate the model fit. Internal consistency (Cronbach α) wasmeasured for the final scale version.Results: Exploratory Factor Analysis (EFA) resulted in a parsimonious 10-item, two-factor structure (5 items each,factor loadings > 0.3) that explained 52.83% of total variance. Based on the Pattern Matrix, Factor 1 was labelled“Positive Cues to Action” and Factor 2 was labelled “Negative Cues to Action”. After addressing some errors incovariances, CFA showed a good fit where all fit indices were larger than 0.90 (GFI = 0.968, CFI = 0.938) and smallerthan 0.08 (RMSEA = 0.072, RMR = 0.041). The standardized coefficients of Factor 1 and Factor 2 ranged from 0.30 to0.73 and were all statistically significant (p Conclusions: The new MOCHAD-10 (Motivation to Change Behaviour for Dementia Risk Reduction Scale) is a short,reliable and robust two-factor, 10-item clinical tool for use in preventative health care and research to evaluatemotivation to change lifestyle for dementia risk reduction.

Item Type: Article
Authors/Creators:Oliveira, D and Aubeeluck, A and Stupple, E and Kim, S and Orrell, M
Keywords: dementia, prevention, risk reduction, clinical tool, scale development, outcome measure, validation, psychometrics, exploratory factor analysis, confirmatory factor analysis
Journal or Publication Title: Health and Quality of Life Outcomes
Publisher: BioMed Central Ltd.
ISSN: 1477-7525
DOI / ID Number: 10.1186/s12955-019-1143-8
Copyright Information:

Copyright 2019 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

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