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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

Citation

Oliveira, D and Aubeeluck, A and Stupple, E and Kim, S and Orrell, M, 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, 17, (11) pp. 1-7. ISSN 1477-7525 (2019) [Refereed Article]


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DOI: doi:10.1186/s12955-019-1143-8

Abstract

Background: Modifying lifestyle risk factors for dementia is a public health priority. Motivation for change is integral to the modification of health-related risk behaviours. This study investigates the psychometric properties of the previously validated tool entitled ‘Motivation to Change Lifestyle and Health Behaviours for Dementia Risk Reduction 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. The psychometric properties of the scale were explored via Exploratory Principal Axis Factoring (PAF) with Oblimin rotation. Confirmatory Factor Analysis (CFA) was used to confirm the factor structure using chi-square (χ2), the goodness-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) was measured 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 in covariances, CFA showed a good fit where all fit indices were larger than 0.90 (GFI = 0.968, CFI = 0.938) and smaller than 0.08 (RMSEA = 0.072, RMR = 0.041). The standardized coefficients of Factor 1 and Factor 2 ranged from 0.30 to 0.73 and were all statistically significant (p < 0.001). The final scale showed moderate to high reliability scores (Factor 1 α = 0.809; Factor 2 α = 0.701; Overall α = 0.785).

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 evaluate motivation to change lifestyle for dementia risk reduction.

Item Details

Item Type:Refereed Article
Keywords:dementia, prevention, risk reduction, clinical tool, scale development, outcome measure, validation, psychometrics, exploratory factor analysis, confirmatory factor analysis
Research Division:Medical and Health Sciences
Research Group:Public Health and Health Services
Research Field:Aged Health Care
Objective Division:Health
Objective Group:Specific Population Health (excl. Indigenous Health)
Objective Field:Health Related to Ageing
UTAS Author:Kim, S (Dr Sarang Kim)
ID Code:136656
Year Published:2019
Deposited By:Wicking Dementia Research and Education Centre
Deposited On:2020-01-13
Last Modified:2020-01-13
Downloads:0

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