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Further validation of the Warwick-Edinburgh Mental Well-being Scale (WEMWBS) in the UK veterinary profession: Rasch analysis.

Further validation of the Warwick-Edinburgh Mental Well-being Scale (WEMWBS) in the UK veterinary profession: Rasch analysis.
Further validation of the Warwick-Edinburgh Mental Well-being Scale (WEMWBS) in the UK veterinary profession: Rasch analysis.
PURPOSE: To examine the psychometric properties of the 14-item Warwick-Edinburgh Mental Well-being Scale (WEMWBS) in the UK veterinary profession by the application of Rasch analysis, and to assess the external construct validity of the derived interval scale measurements.

METHODS: Data sets were derived from two independent cross-sectional surveys of the veterinary profession (n = 8,829 and n = 1,796). Rasch analysis (n = 500) included response option thresholds ordering, tests of fit, differential item functioning, targeting, response dependency, and person separation index (PSI). Unidimensionality was evaluated by principal component analysis of residuals. The findings were validated across further subsamples from both data sets. The external construct validity of the Rasch-fitting item set was evaluated by associations with other measures of psychological health or psychosocial work characteristics.

RESULTS: Data for the original 14 items deviated significantly from Rasch model expectations (chi-square = 558.2, df = 112, P = <0.001, PSI = 0.918). A unidimensional 7-item scale (Short WEMWBS, SWEMWBS) with acceptable fit to the model (chi-square = 58.8, df = 56, P = 0.104, PSI = 0.832) was derived by sequential removal of the most misfitting items. The external construct validity of SWEMWBS was supported.

CONCLUSIONS: SWEMWBS has robust interval-level measurement properties which support its suitability as an indicator of population mental health and well-being in this occupational group with elevated suicide risk.

0962-9343
379-391
Bartram, David J.
b16ac0ee-eb7c-4cde-8c79-5a4d12a7d48b
Sinclair, Julia M.
be3e54d5-c6da-4950-b0ba-3cb8cdcab13c
Baldwin, David S.
1beaa192-0ef1-4914-897a-3a49fc2ed15e
Bartram, David J.
b16ac0ee-eb7c-4cde-8c79-5a4d12a7d48b
Sinclair, Julia M.
be3e54d5-c6da-4950-b0ba-3cb8cdcab13c
Baldwin, David S.
1beaa192-0ef1-4914-897a-3a49fc2ed15e

Bartram, David J., Sinclair, Julia M. and Baldwin, David S. (2013) Further validation of the Warwick-Edinburgh Mental Well-being Scale (WEMWBS) in the UK veterinary profession: Rasch analysis. Quality of Life Research, 22 (2), 379-391. (doi:10.1007/s11136-012-0144-4). (PMID:22383106)

Record type: Article

Abstract

PURPOSE: To examine the psychometric properties of the 14-item Warwick-Edinburgh Mental Well-being Scale (WEMWBS) in the UK veterinary profession by the application of Rasch analysis, and to assess the external construct validity of the derived interval scale measurements.

METHODS: Data sets were derived from two independent cross-sectional surveys of the veterinary profession (n = 8,829 and n = 1,796). Rasch analysis (n = 500) included response option thresholds ordering, tests of fit, differential item functioning, targeting, response dependency, and person separation index (PSI). Unidimensionality was evaluated by principal component analysis of residuals. The findings were validated across further subsamples from both data sets. The external construct validity of the Rasch-fitting item set was evaluated by associations with other measures of psychological health or psychosocial work characteristics.

RESULTS: Data for the original 14 items deviated significantly from Rasch model expectations (chi-square = 558.2, df = 112, P = <0.001, PSI = 0.918). A unidimensional 7-item scale (Short WEMWBS, SWEMWBS) with acceptable fit to the model (chi-square = 58.8, df = 56, P = 0.104, PSI = 0.832) was derived by sequential removal of the most misfitting items. The external construct validity of SWEMWBS was supported.

CONCLUSIONS: SWEMWBS has robust interval-level measurement properties which support its suitability as an indicator of population mental health and well-being in this occupational group with elevated suicide risk.

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e-pub ahead of print date: 2 March 2013
Organisations: Faculty of Medicine

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Local EPrints ID: 346382
URI: https://eprints.soton.ac.uk/id/eprint/346382
ISSN: 0962-9343
PURE UUID: 585c2332-aff6-4c17-be27-ecdd93e568ab
ORCID for Julia M. Sinclair: ORCID iD orcid.org/0000-0002-1905-2025

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Date deposited: 15 Jan 2013 14:13
Last modified: 20 Jul 2019 01:15

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Author: David J. Bartram

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