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Measurement invariance of the Positive Gains Scale in families of children with and without disabilities

Jess, M; Bailey, T; Pit-ten Cate, IM; Totsika, V; Hastings, RP; (2020) Measurement invariance of the Positive Gains Scale in families of children with and without disabilities. Research in Developmental Disabilities , 103 , Article 103662. 10.1016/j.ridd.2020.103662. Green open access

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Abstract

Background: Despite the high frequency of case-control studies in the developmental disability literature, there is a paucity of research establishing the measurement equivalence of instruments used, and particularly those relating to positive perceptions and experiences in family disability research. / Aims: The present study sought to establish measurement invariance for the Positive Gains Scale (PGS) across 1219 mothers of children with developmental disabilities, 234 mothers of children with spina bifida/hydrocephalus, and 157 mothers of children without disabilities. / Methods and procedures: A three-step test for measurement invariance across the three groups was conducted using Multigroup Confirmatory Factor Analysis. / Outcomes and results: Loadings between the three groups were invariant, suggesting the criteria to assume metric invariance was met. However, the assumption of scalar invariance was not met, suggesting that item intercepts differed between the three groups. / Conclusions and implications: Our findings suggest that the PGS cannot be meaningfully used to compare outcomes between mothers of children with developmental disabilities and other mothers. These findings may have wider implications for research utilising well-being measures to make comparisons with carers of children with developmental disabilities.

Type: Article
Title: Measurement invariance of the Positive Gains Scale in families of children with and without disabilities
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.ridd.2020.103662
Publisher version: https://doi.org/10.1016/j.ridd.2020.103662
Language: English
Additional information: This is an Open Access article published under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) Licence (https://creativecommons.org/licenses/by-nc-nd/4.0/).
Keywords: Developmental disability, Measurement invariance, Case-control studies, Positive gain
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Division of Psychiatry
URI: https://discovery.ucl.ac.uk/id/eprint/10098835
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