- Open Access
Measuring the well-being of people with dementia: a conceptual scoping review
Health and Quality of Life Outcomes volume 18, Article number: 249 (2020)
Enabling people with dementia to ‘live well’ is a policy and research priority in many countries. However, instruments for measuring outcomes of psychosocial interventions designed to promote well-being in dementia are often derived from a symptom-focused, loss/deficit approach, or from broad quality of life concepts. A pan-European dementia working group called for research on the development of an alternative asset/strengths-based conceptual framework of well-being in dementia. This paper takes forward this recommendation by developing such a framework and using this to map relevant self-report outcome measures.
Three scoping reviews of published studies were conducted iteratively. First, we examined the literature on lived experiences of well-being and quality of life in people with dementia and then the wider dementia literature for application of well-being constructs. The synthesised findings generated conceptual domains of well-being in people with dementia. Corresponding self-report instruments used in dementia research were scoped, categorised within the conceptual framework and their potential value in measuring outcomes for people with dementia was examined.
Six conceptual domains for the measurement of well-being and 35 self-report instruments that have been used with people with dementia were identified. Six instruments were developed specifically for people with dementia, five were derived from the gerontological literature and 24 from the well-being literature. Fifteen instruments and one sub-scale have been examined for psychometric properties amongst people with dementia. To date, 20 have been used as outcome measures, with seven measuring change over time. A number of identified instruments utilise traditional retrospective Likert-scaling response formats, limiting their potential for use with some groups of people with dementia.
An assets/strengths-based framework is presented, outlining structural domains for selecting self-report measures of well-being in people with dementia. It provides a foundation for enhancing research into processes and outcomes of psychosocial interventions, including instrument development, more precise matching of intervention aims with outcome measurement, and newer technology-based ‘in-the-moment’ measurement.
Internationally, supporting people to live well with dementia has become the focus of varied public health and research initiatives. Living well with a long-term health condition such as dementia implies the ongoing presence of well-being within a supportive social environment, in spite of health-related adversity. However, psychosocial intervention research in dementia has typically focused on the measurement of cognitive function and/or symptom-reduction (e.g. depression/neuropsychiatric symptoms), even in studies that have also incorporated measures of quality of life (QoL) / health-related quality of life (HRQoL).
Whilst many studies demonstrate that people with dementia can give reliable accounts of their life using existing dementia-specific QoL/HRQoL self-report instruments [1, 2], such measures do not capture the full range of psychosocial outcomes that people with dementia themselves consider important, such as autonomy . Recent studies on how people with dementia might live well with the condition indicate that asset-based factors such as self-efficacy and humour contribute significantly to overall well-being [4, 5]. These factors are closely aligned to the concept of well-being but are not fully captured by traditional Qol/HRQoL instruments.
Moreover, the constructs of QoL and well-being have often been used inter-changeably in dementia research, raising concern about the construct validity of QoL scales . For example, the DEMQOL , an established HRQoL measure, subsumes well-being within one of five domains (i.e. ‘health and well-being’), whilst other authors frame ‘subjective well-being’  as related but not equivalent to QoL . Existing research indicates that people with dementia can have a broad range of positive lived experiences , influenced by personal and contextual resources . Despite this, a conceptually driven approach to the measurement of these experiences, as potential outcomes of asset-building psychosocial interventions (e.g. those aimed at facilitating agency, participation and social engagement), has so far been lacking.
As such, an important challenge lies in how best to conceptualise well-being and its associated measurement in people with dementia, beyond existing approaches based on QoL. Developing clear conceptual frameworks would in turn underpin valid measurement of well-being in dementia . The application of positive psychology  and successful/positive aging gerontological concepts  has the potential to meet this challenge. From a positive psychology perspective, Dodge and colleagues  define well-being in terms of a state of equilibrium existing between personal resources and life challenges that, when achieved, gives rise to positive emotions and psychological health. This provides a conceptual rationale for subsuming subjective QoL experiences within overarching domains of psychological and social well-being [16, 17], an approach that has synergies with Kitwood’s landmark conceptualisation of well-being and personhood in dementia  (see page 8). Additionally, despite the challenges of age-related chronic health conditions, gerontological perspectives show how the successful negotiation of key psychosocial tasks, along with participation and social engagement, can contribute to well-being in terms of successful/positive ageing [19,20,21].
The application of asset-based perspectives in dementia care is relatively new. A recent trial aimed to improve everyday function through assisting people with dementia to achieve personally meaningful and relevant goals. Significant gains on the primary outcome measure (attainment of these goals)  were not mirrored on other outcome measures such as cognition, self-efficacy, mood or dementia-specific HRQoL, demonstrating the insensitivity of current measures to changes personally relevant to people with dementia. Emerging, innovative psychosocial creative and arts-based interventions in dementia that seek to enhance specific aspects of well-being in dementia also require conceptually valid self-report outcome measures to assess accurately their effectiveness [23, 24]. Within this context, a pan-European dementia research programme conducted preliminary work to chart new territory in outcome measurement in dementia . The authors called for further research into asset-based self-report measures. Stoner and colleagues  subsequently identified 12 instruments that have been used in research to measure positive psychology constructs in people with dementia. These instruments covered constructs such as identity, hope, optimism, religiosity/spirituality, life valuation, self-efficacy, sense of community and psychological well-being. Such work indicates how, relative to QoL measures, well-being instruments rooted in specific positive constructs offer wider scope and specificity in relation to measuring psychological outcomes in dementia.
The aim of the present study was to extend this work, using scoping reviews to develop an asset/strengths-based conceptual framework for the measurement of well-being in people with dementia, and to use this to map the full range of currently available corresponding self-report instruments that have been used with this population. Our approach is theory-based and empirically-informed, drawing on the successful/positive aging  and positive psychology  literatures, starting with accounts of lived experiences as the key context for conceptualising well-being in people with dementia.
The specific questions underpinning this review were:
What key conceptual domains of well-being can be derived from existing literature involving people with dementia?
How have positive psychology and successful / positive aging gerontological concepts been applied to understanding experiences of well-being in people with dementia?
What corresponding self-report instruments have been used with people with dementia in published research?
We combined principles for scoping reviews [27, 28] with constant comparative methods for analysis  to capture the breadth of the literature about well-being in people with dementia, whilst also highlighting current gaps in knowledge. Accordingly, we did not evaluate the methodological quality of studies. We reviewed existing published literature on lived experiences and well-being in people with dementia to synthesise an analytic framework for outcome measurement of well-being. Then we categorised existing self-report instruments used in research involving people with dementia, within corresponding conceptual domains. The PRISMA-ScR checklist  for scoping reviews guided these reviews.
Overall Inclusion/exclusion criteria: these were based on previous expert consensus work involving several face-to face meetings with one person with dementia, two carers as well as representation from Alzheimer’s Europe (DG & AD) . These criteria were refined by core authors (CC, EM-C, BW & GM) and verified with the wider review team before application. In accordance with the population/concept/context (PCC) framework , inclusion criteria were: qualitative and quantitative peer reviewed studies published in the English language, involving strengths, assets and positive experiences of people living with any type or stage of dementia (i.e. population), across all community and clinical settings (i.e. context). To identify relevant instruments, we focused specifically on self-report measures (i.e. context) of different dimensions of well-being, aligned to positive psychology and gerontological / successful ageing constructs (i.e. concept). Exclusion criteria were: grey / non-peer reviewed reports; studies involving non-dementia populations, carers or other dementia care stakeholders (i.e. excluded population) and studies focused or based on a loss/deficit or disability perspective, including studies adopting a symptom-focused approach (i.e. excluded concepts)  .
Study procedures: study selection involved identifying eligible studies (CC), reviewing their titles/abstracts (CC and EM-C), scrutinising relevant full texts against inclusion criteria, removing duplicates (CC & EM-C), collating and tabulating records (CC) and obtaining independent advice from two authors (BW & GM) in order to resolve ambiguity or uncertainty with regard to study selection and data extraction. Such discussions ensured reliability and occurred at selection and synthesis stages. Independent advice from co-authors (BW & GM) occurred on five occasions; one related to study selection, three in relation to concept synthesis and one regarding instrument mapping.
Three reviews were conducted using the following four steps:
Step 1: review of reviews - the lived experience of well-being in people with dementia
To obtain an overview of how people with dementia experience aspects of well-being, existing reviews, rather than primary studies, were sought. Web of Science and PsycINFO were searched using the following terms: ‘lived experience’, ‘well-being’, ‘positive experiences’, ‘quality of life’ and ‘dement*’. To be included, reviews had to focus explicitly on lived experiences of well-being and quality of life so that we would be able to develop conceptual domains rooted in the day-to-day experiences of people with dementia. Eligible reviews were therefore scrutinised to exclude associations with the loss/deficit paradigm (e.g. experiences of ‘suffering’ with dementia). Independent arbitration between reviewers was not required at this step. Using thematic synthesis , tabulated key findings from each review were used to generate preliminary descriptive themes.
Step 2: review - application of key well-being concepts in dementia
To refine preliminary themes from step 1 we extended our search to examine our second research question on how positive psychology and successful/positive aging gerontological concepts have been applied to understanding well-being in people with dementia. We systematically searched PsycINFO, MEDLINE and CINAHL-complete for studies relating to concepts of well-being applied to dementia and published before January 2018. The gerontological and positive psychology literature was used to generate the following search terms: dement* combined with acceptance, autonomy, purpose, self-determination, positive affect, positive emotion, hope, optimism, humor(ur), spirituality, meaning, self-efficacy, self-esteem, self-identity, resilience, belonging, intimacy and social participation (see Additional File 1). The same inclusion and exclusion criteria as above were applied to capture views and/or experiences of people with dementia expressed via standardised questionnaire measures or qualitative interviews. Studies involving only proxy reports, observational methods or anecdotal case reports were excluded. Studies that had contributed to our first review at Step 1 (i.e. included in selected reviews) were excluded at this step to avoid duplication. Where ambiguity arose, such as inclusion of data from dyads, studies were only included if primary data on the experiences of people with dementia was evident.
Included studies were organised and tabulated. Data extracted from each study were authors, year published, design and methods, number and demographic characteristic of people with dementia, and key findings on well-being in dementia. Self-report instruments used in included studies were also identified and included for consideration at Step 4. Principles of framework analysis  were used to categorise findings, using the themes derived at Step 1.
Step 3: synthesis
To develop a conceptual framework of domains relevant to outcome measurement of well-being in dementia, we refined the preliminary themes from Step 1 using narrative synthesis  by integrating the findings from qualitative and quantitative studies gathered at Step 2. From this, overarching ‘analytic’ themes  were generated using key constructs from the wider well-being literature [8, 15, 16, 35, 36].
Step 4: review - identifying and categorising self-report measures of well-being in dementia
This third review was to update the inventory of instruments generated from the previous consensus study  and align this to proposed conceptual domains of well-being in people with dementia. Studies using self-report measures of well-being in dementia (published before January 2019) were searched for using PsychINFO, MEDLINE, and CINAHL Complete, using terms generated from the theoretical domains developed at Step 3.
The same inclusion and exclusion criteria as above were applied to scrutinise measures of global well-being and/or specific aspects of well-being or successful/positive ageing, including personal strengths and abilities. Hand searching of reference lists and methods sections of dementia studies that had used instruments measuring concepts of well-being, including those taken from studies at Step 2, was also conducted (CC & EM-C) but no other additional sources were used. Studies using a single-item question to measure well-being, rather than a formal instrument, as well as those unavailable in the English Language, [37, 38] were excluded. Instruments based on observation or proxy reports, such as the Music in Dementia Assessment Scales (MiDAS) , were also excluded because of the explicit focus on self-reported well-being. All authors reviewed the final list for instruments that may have been missed.
Instruments were categorised according to conceptual domains of well-being in dementia and scrutinised for whether they were developed specifically for people with dementia, and designed as an outcome measure. Studies using each instrument were examined to ascertain if psychometric properties and sensitivity to change had been reported with a dementia sample and whether the instrument had been used in longitudinal or intervention studies. Acceptability and ease of use for people with dementia was also examined, covering aspects such as number of items, response formats, scaling and retrospective judgements.
Lived experiences of well-being in people with dementia
After excluding duplicates and applying limits, searches yielded 200 potentially relevant review articles. Most were excluded because they focused on caregivers or did not review well-being. Of the remaining full text articles, only four systematic reviews directly related to the lived experience of well-being or quality of life in people with dementia. These covered 86 separate studies, totalling 2545 people with dementia (age range 20–100 years; majority female) across community and residential settings, from both developed and developing nations (Additional File 2).
Descriptive themes in lived experiences of well-being in dementia were synthesised into six preliminary themes:
Feeling Positive: positive emotional states often experienced in the ‘here and now’. Includes hopefulness/humour; positive attitudes - acceptance/ optimism.
Life Having Meaning: making sense of dementia. Shifting perspectives towards existential meanings such as notions of transcendence/spiritual growth.
Positive Sense of Self: self-worth, sense of identity (‘I am’) and self-efficacy.
Keeping Going and Being Active: sense of agency – adaptation/resilience; purpose/ autonomy. Demonstrated by active choices to function ‘normally’ and engage purposefully in meaningful activities which enhance positive emotions.
Good Relationships: positive aspects of interpersonal and social relationships. Includes attachment and connection (a sense of belonging and safety) as well as feeling valued, loved and accepted by others.
Feeling Well: a cross-cutting theme of feeling contented and satisfied with life ‘as it is’.
Application of well-being concepts to dementia
A total of 4405 potentially eligible papers were identified and 153 full-text papers were screened (Fig. 1). The final pool included 48 studies. These originated from several different nations and included a total of 3301 people with dementia (all sub-types). Participants were aged between 54 and 96 years, with the majority over 70 years and female. Settings included: nursing/residential care (n = 9); community / out-patients/ memory clinics (n = 37) and mixed community / residential care (n = 2) (see Additional File 3).
Of the 20 quantitative studies, six involved the evaluation of psychosocial interventions, such as a pilot trial of self-management for people with dementia reporting positive impact on self-reported self-efficacy . Seven were longitudinal, covering topics such as positive affect , self-concept  and relationship quality . The remaining were cross-sectional designs, investigating specific constructs e.g. spirituality , or associations between different concepts such as links between hope, social support and self-esteem . Qualitative studies (n = 24) varied in methods and scope, mostly exploring specific constructs, including resilience . Four studies examined the impact of an intervention on general aspects of well-being e.g. perceived benefits of laughter  or specific factors such as impact of exercise on self-efficacy . Mixed-methods (n = 4) studies covered topics ranging from goal-setting  to experiences of friendships .
Five constructs set within the overarching themes of emotional, psychological and social well-being emerged. Examination of studies of hope in people with dementia differentiated hope as a feeling (i.e. positive affect) from the notion of ‘going beyond’ personal goals to find broader meanings and connections, in spite of uncertainty. The sixth broader construct of ‘Valuing Life’ aligned to the construct of life satisfaction  and its closer association with quality of life in dementia . Resilience in dementia [46, 51, 52] did not fit easily into one domain. Two studies [46, 51] frame resilience in terms of a strong sense of agency and purpose, achieved through activity and continuity, whilst the third  describes experiences of continued social and community engagement as underpinning the construct of resilience. A proposed new framework for the measurement of well-being in dementia can be found in Table 1.
Self-report instruments for measuring well-being in people with dementia
Thirty-five self-report instruments (of which one instrument has two independently developed sub-scalesFootnote 1) used in dementia research were identified and allocated to respective conceptual domains (Table 2). For example, the Gratitude Questionnaire  was categorised within ‘Social Well-being: Connection and Belonging’, since gratitude is seen as a social construct , whilst the Engagement and Independence in Dementia Questionnaire - EID-Q  -, contained just one item for participation in hobbies, and none on social engagement, so this instrument was allocated to ‘Psychological Well-Being: Agency and Purpose’.
Forty studies that have used these instruments with people with dementia were identified. These studies originated from a range of developed and developing nations and collectively included approximately 3676 people with dementia (see Additional File 4. Average reported ages were 72.9 to 91 years. Participants in these studies tended to be female and community dwelling. Nine studies involved people living in residential or institutional settings.
Whilst all included instruments can be construed within an asset/strengths-based perspective on well-being, their conceptual origins varied. For example; the WHO-5  originated from a pragmatic need to measure well-being outcomes in services; the Gratitude Questionnaire GQ-6 ; measures a specific positive psychology construct; the Thriving Scale  arose from the gerontological literature on well-being; the CASP  is presented as a QoL measure but items cover asset-based constructs of well-being. The PANAS  specifically measures affect and mood, the PDI dignity instrument  arose from the end of life care literature, and the QCPR  from caregiving studies.
Only six instruments were specifically developed for people with dementia. These are; the Positive Psychology Outcome Measure - PPOM , which comprises separable measures of hope and resilience; the Engagement and Independence in Dementia Questionnaire - EID-Q ; the Dementia Mood Picture Test - DMPT ; the Decision-Making Involvement Scale - DMI ; and the Self-Identity in Dementia Questionnaire - SID-Q . Psychometric properties with dementia populations were reported for only 16 measures but these were variable in scope (see Additional File 4). Particular psychometric weaknesses included sensitivity to change, number of items unsuitable for the full range of people with dementia and complicated response formats.
Nineteen instruments were explicitly developed for outcome measurement. Twenty have been used to measure outcomes in longitudinal (n = 4) or intervention (n = 16) dementia research, but only three of these have been validated with people with dementia: DMPT , DABS  and the SPWB - Purpose in Life sub-scale  - see Additional File 4. Seven have demonstrated some degree of sensitivity to change in terms of reporting treatment effect. These are: SPWB ; WHO-5 ; LSI  GSE ; SIWB-12 ; HHI ; BGSI . Five have been used in intervention studies although they may not have been designed as outcome measures per se. These are: PANAS ; RSES-10 ; SES-23 ; BSCS-8  and the LSI-18 . The full psychometric properties of these instruments for dementia populations have yet to be established.
Seventeen instruments have more than ten items (Additional File 4). Short instruments include the: WHO-5 ; GQ-6 ; and PAI-5 . Long instruments include the DABS-40  and SPWB-84 , although its sub-scales have been used independently . Most instruments have a 4 or 5-point Likert-based response format, but some such as the MLQ-10  extend to 7-Likert points. Four instruments use retrospective response formats, requiring episodic memory, e.g. ‘rate how you have felt over the preceding 2 weeks’. These are the dementia-specific EID-Q and PPOM, [68, 77] the WHO-5, validated for older people , and the SWEMWBS , which despite its retrospective nature is used as a core outcome measure in many clinical dementia services in the UK .
As new theory-driven psychosocial interventions aimed at improving the well-being of the people with dementia emerge, selecting valid instruments to measure their effectiveness remains a challenge. In support, this study establishes the availability of a wide range of self-report instruments that can be used to measure specific aspects of well-being in dementia. In turn, our findings support more precise alignment of outcome measurement to the underlying concepts of a given well-being intervention, as well as aiding research seeking to further understand mechanisms of change.
This scoping review identified 35 self-report instruments, corresponding to 17 constructs of well-being in dementia, set within 4 overarching domains and 6 sub-domains (see Table 2 & Fig. 2). It builds on a previous systematic review of positive psychology measures (which included quality ratings of instruments), where only 12 instruments used in 17 studies were located . By combining the sucessful/positive aging gerontological literature, we identified several additional instruments (Table 2) that have been used with people with dementia and have potential for instrument development and future research (e.g. WHO-5 well-being index; Spirituality Index of Well-Being; Thriving Scale; Gratitude Scale).
Our findings also expand on a related review , which identified only seven measures of well-being taken from six studies, none of which were developed specifically for measuring well-being in people with dementia. The scarcity of studies of well-being and life satisfaction in people with dementia is evident as the authors  report insufficient available data for meta-analyses on these two constructs.
Our findings therefore extend the scope of an asset-based conceptualisation of well-being outcome measurement in dementia by highlighting the range and specificity of instruments that could be applied to measuring how people with dementia can be supported to live well via psychosocial interventions and community programmes.
Psychological, social and emotional well-being
These 3 overlapping and overarching domains for the measurement of well-being in people with dementia (see Fig. 2 – conceptual map of outcomes) resonate with Keyes’ model  of well-being. Our framework also concurs with the definition of well-being  as a state of equilibrium that, when achieved, gives rise to positive psychological health. Such models propose that positive functioning exists across inter-related domains of well-being, reflecting equilibrium and a potential state of ‘flourishing’ , which this review demonstrates can be measurable in spite of the challenges of dementia and multi-morbidities that co-occur in aging.
Evidence for both hedonic (e.g. emotional pleasure; happiness) and eudaimonic  well-being in people with dementia can be seen from the synthesised domains. Eudaimonic (psychological) well-being is the most salient overarching domain where, depending on the concept underlying a given intervention, subjective perceptions of positive functioning may be measurable using instruments categorised within the domains of ‘Agency & Purpose’ or ‘Positive Sense of Self’ (Fig. 2).
Of the 16 measures that have been investigated for their psychometric properties with people with dementia, 11 fitted into the overarching domain of psychological well-being, involving agency and associated meaningful engagement. Positive relationships and personal growth across the life span  also emerged as aspects of psychological well-being and in studies of lived experiences of well-being in dementia, where some people ‘transcend’ the condition by finding ways to maintain identity and discover new meanings within their experiences . A recent large cohort study found that psychological health (e.g. self-efficacy / positive attitudes towards aging) is strongly associated with subjective perceptions of ‘living well’ in people with dementia . Future research with instruments corresponding to psychological wellbeing could extend emerging knowledge on agency, gratitude, gerotranscendence and personal growth [66, 118,119,120,121,122]. The conceptual domain of psychological well-being and its corresponding instruments (Fig. 2; Table 2) represent an important alternative to existing QoL-based approaches in dementia, which tend not to capture specific and personally meaningful experiences such as hope, self-efficacy and resilience.
Social well-being aligned with the social health-dementia paradigm [123, 124], reflecting ‘Connection and Belonging’ in terms of reciprocity, relationships and social connections. These factors constitute additional potential resources for people with dementia that can help sustain the equilibrium and positive functioning that in turn underpins well-being. Instruments identified in this domain are at an early stage of development; of the 16 measures that have been investigated for their psychometric properties with people with dementia only the 6-item Gratitude Questionnaire  relates to social well-being. However, the seven instruments included in this domain provide scope for improving the measurement of positive aspects of reciprocal interpersonal social relationships, participation, citizenship and human rights [125, 126] for people with dementia.
Emotional well-being in dementia has not been well studied, possibly due to biases toward the traditional loss/deficit dominant paradigm of mood disorders. Within this conceptual framework the notion of ‘affect balance’ (i.e. the ratio of positive to negative affect over a specified time period) holds potential for the measurement of emotional well-being in dementia. Kolanowski et al.  found that in people with dementia living in nursing homes, those with higher ‘positivity ratios’ had higher levels of social activity, engagement, general well-being and associated resilience. Measurement of affect-balance aligns with the domain of emotional well-being and suggests new territory for the conceptualisation and measurement of resilience in people with dementia.
Life satisfaction (valuing life)
This fourth overarching conceptual domain of life satisfaction (or ‘Life Valuation’ ) emerged as a broader underpinning construct, reflecting overall well-being (Fig. 2), and referring to a general sense of ‘feeling well’ or ‘valuing life’ (Table 2). Studies of well-being and life satisfaction in people with dementia appear to examine different factors apart from mood , which may be due to convergence between certain aspects of well-being and emotion . Further research is needed to explore these relationships in the context of living with dementia. The instruments categorised with this domain reflect the complex multi-dimensional nature of well-being. Only two instruments in this domain, the CASP [59, 61] and the SWLS [66, 109] have been validated in dementia to date.
Resilience was embedded across different well-being domains. The construct is represented as agency , social connection [52, 129] and emotional resilience  in the current literature on living with dementia. Thus resilience, whilst measurable as an outcome in itself , can also be conceptualised as a process of ongoing positive adjustment in which people with dementia maintain well-being by utilising various social, psychological and developmental resources as they engage with adversity . Instruments identified for measuring resilience in dementia cover adaptation to the consequences of dementia with agency and purpose [66, 68] but they currently fail to capture the dynamic social processes of continued social and community engagement that are associated with resilience [52, 129].
Outcome measures for well-being in dementia
None of the instruments developed for people with dementia have yet demonstrated sensitivity to change and none have been formally evaluated for their responsiveness and interpretability i.e. the ability to detect clinically and personally meaningful change in aspects of well-being over time .
Self-report outcome measures of well-being should be acceptable and easy to complete for the majority of people with dementia. The measures we identified vary in length (number of items) and complexity of Likert scaling, with some requiring retrospective judgements. This may be problematic for people with difficulties in episodic memory as well as lacking in face validity as people with dementia appear to prefer to report ‘in the moment’ benefits of interventions as they are experienced . This is particularly relevant to capturing meaningful outcomes of interventions such as creative arts-based activities that seek to enhance engagement, social participation and positive affect as they occur .
Our review has some limitations. First, despite making every attempt to include the relevant literature, some studies and instruments may not have been identified. This is an inherent problem with iterative scoping review methodology. Second, whilst key information was synthesised and reported in summary tables, statistical techniques were not used to assess methodological quality and we did not formally evaluate the quality of included instruments or examine their psychometric properties. This was in keeping with scoping review methods and the heterogeneity of included studies but also highlights the potential for a future systematic review to address these issues. Third, for some instruments used in dementia studies, it was not possible to categorically define if they had originally been developed as outcome measures per se; for example the General Self-Efficacy Scale may be seen as measuring a ‘trait-like’ variable. Examining instrument items is an important consideration when selecting outcome measures intended to be responsive to meaningful changes over time. Fourth, this review only included articles published in English. Fifth, our scope was to chart self-report instruments, so important proxy and observer-rated measures, e.g. MiDAS,  were excluded. Finally, we do not provide specific recommendations on measures with strong evidence for use. However, instruments that show validity and potential sensitivity to change in dementia, such as the Herth Hope Index- HHI-12 , have good potential for the design of future psychosocial dementia care studies.
The conceptual framework we present outlines structural domains for selecting self-report measures of well-being in dementia, going beyond QoL/HRQoL instruments used in research to date. It provides a foundation for further research into the process and outcomes of creative well-being enhancing interventions as well as supporting instrument development and the more precise matching of intervention aims with outcome measures. Thirty-five instruments used to date in dementia studies provide a bank of asset-based self-report instruments for future research on well-being in people with dementia. Valid asset/strength-based approaches to the measurement of psychosocial interventions in dementia require good underlying knowledge-frameworks of well-being, which should resonate with the lived experiences of people with dementia.
The next steps in this research agenda include: co-producing  new and/or selected key instruments that are matched to meaningful activities and interventions available to people with dementia in their communities; improving and demonstrating the psychometric properties of identified instruments; involving people with dementia in culturally-sensitive outcome measurement ; and exploring the potential of technological solutions, such as experience sampling , to capture ‘in the moment’ well-being outcomes from interventions. Future research in these areas will elucidate how people with dementia might ‘flourish’ in the ‘here-and-now’, despite the challenges of the condition.
Availability of data and materials
All data generated or analysed during this study are included in this published article [and its supplementary information files].
PPOM sub-scales treated as separate measures as psychometric properties have been established independently for each (see Stoner, 2018a).
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1. Dr. Lesley Glover (Faculty of Health Sciences, University of Hull, Hull HU6 7RX, UK.); for qualitative methods advice.
2. The ‘DEMENTIA OUTCOME MEASURES: CHARTING NEW TERRITORY’ INTERDEM group, for contribution to the previous JPND funded work – see https://www.neurodegenerationresearch.eu/wp-content/uploads/2015/10/JPND-Report-Fountain.pdf from which the current study was conceived.
3. Mr. Gavin Dawson (Project Assistant, Research Team, Humber Teaching NHS Foundation Trust, Willerby Hill, Beverley Road, East Riding of Yorkshire, UK, HU10 6ED); for assistance with referencing and formatting.
Preliminary reviews and consensus work that formed the basis of this study was funded by the EU Joint Programme – Neurodegenerative Disease Research (2014 – Longitudinal Cohorts).
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Summary Example of Search Strategy (at Step 2; Application of Well-Being Concepts to Dementia). Data: Summarised search results.
Review of Reviews - Lived Experiences of Well-Being and Quality of Life in Dementia: Key Findings and Themes. Data: Tabulated and synthesised findings.
Domains of well-being in dementia - conceptual synthesis. Data: Tabulated and synthesised findings.
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Clarke, C., Woods, B., Moniz-Cook, E. et al. Measuring the well-being of people with dementia: a conceptual scoping review. Health Qual Life Outcomes 18, 249 (2020). https://doi.org/10.1186/s12955-020-01440-x
- Outcome measurement
- Quality of life
- Positive psychology
- Successful aging
- Lived experience