Abstract
BackgroundSWEMWBS is a popular measure of mental wellbeing, shown to be valid in clinical populations. Responsiveness to change has not yet been formally assessed.MethodsAnalysis of data from a clinical sample of 172 clients undergoing up to 4 sessions of cognitive hypnotherapy. Cohen’s D effect size (ES), Standardised response mean (SRM), probability of change statistic (P^) were used to evaluate whether SWEMWBS detected statistically important changes at the group level. Cohen’s D effect size (ES) and Standard error of measurement (SEM) and were used to evaluate whether SWEMWBS detected statistically important changes at the individual level.ResultsMean (SD) SWEMWBS scores increased from baseline to therapy 4 from 19.28 (3.921) to 23.32 (4.873). At group level, using Cohen’s D effect size, improvement ranges from ES = 0.20–1.41 and using SRM, ranged from 0.30–0.88, increasing with number of therapy sessions. (P^) ranged from 0.65–0.8. At individual level, use of Cohens D ES > 0.5 indicated statistically important improvement in 29.9–86.1% cf. 20.1–80.6% using a standard of 2.77 SEM (2.87 points). The lower threshold of 1 SEM (1.03 points) indicated statistically important improvement in 43.0–81.0%.ConclusionSWEMWBS is responsive to change at individual and group level. At individual level a change of between 1 and 3 points meets thresholds for statisticially important change, depending on standard used. Anchor based studies are necessary to confirm that such change represents minimally important change from the perspective of study participants.
Highlights
Short Warwick–Edinburgh Mental Well-Being Scale (SWEMWBS) is a popular measure of mental wellbeing, shown to be valid in clinical populations
Research has suggested that Warwick-Edinburgh Mental Well-Being Scale (WEMWBS) and SWEMWBS are well liked by service users and carers, who value the positive wording, self-administered nature and appropriate length [6]
No significant difference in baseline SWEMWBS was found between groups of clients that attended one, two three and four sessions respectively
Summary
SWEMWBS is a popular measure of mental wellbeing, shown to be valid in clinical populations. A seven item version, the Short Warwick–Edinburgh Mental Well-Being Scale (SWEMWBS) was resolved in 2009 using Rasch modelling. Mental wellbeing is beginning to be recognised as an outcome of importance in mental health services [6] where valid outcome measures, usually based on patient self-report, are required by commissioners to monitor the effectiveness of service provision [7]. These measures may be valuable to clinicians for monitoring treatment progress and aiding clinical decision-making [8]. Whilst WEMWBS responsiveness to change has been demonstrated [9], responsiveness of SWEMWBS to change in clinical and community settings has not been formally evaluated
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