Measuring implementation behaviour of menu guidelines in the childcare setting: confirmatory factor analysis of a theoretical domains framework questionnaire (TDFQ)

Kirsty Seward, Luke Wolfenden, John Wiggers, Meghan Finch, Rebecca Wyse, Christopher Oldmeadow, Justin Presseau, Tara Clinton-McHarg, Sze Lin Yoong, Kirsty Seward, Luke Wolfenden, John Wiggers, Meghan Finch, Rebecca Wyse, Christopher Oldmeadow, Justin Presseau, Tara Clinton-McHarg, Sze Lin Yoong

Abstract

Background: While there are number of frameworks which focus on supporting the implementation of evidence based approaches, few psychometrically valid measures exist to assess constructs within these frameworks. This study aimed to develop and psychometrically assess a scale measuring each domain of the Theoretical Domains Framework for use in assessing the implementation of dietary guidelines within a non-health care setting (childcare services).

Methods: A 75 item 14-domain Theoretical Domains Framework Questionnaire (TDFQ) was developed and administered via telephone interview to 202 centre based childcare service cooks who had a role in planning the service menu. Confirmatory factor analysis (CFA) was undertaken to assess the reliability, discriminant validity and goodness of fit of the 14-domain theoretical domain framework measure.

Results: For the CFA, five iterative processes of adjustment were undertaken where 14 items were removed, resulting in a final measure consisting of 14 domains and 61 items. For the final measure: the Chi-Square goodness of fit statistic was 3447.19; the Standardized Root Mean Square Residual (SRMR) was 0.070; the Root Mean Square Error of Approximation (RMSEA) was 0.072; and the Comparative Fit Index (CFI) had a value of 0.78.

Conclusions: While only one of the three indices support goodness of fit of the measurement model tested, a 14-domain model with 61 items showed good discriminant validity and internally consistent items. Future research should aim to assess the psychometric properties of the developed TDFQ in other community-based settings.

Keywords: Childcare; Guidelines; Implementation; Psychometric properties; Theoretical domains framework.

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