Use of the visual analogue scale for health state valuation: a scoping review.

OBJECTIVES: The visual analogue scale (VAS) has been used in the context of health and healthcare for various purposes, for example, to measure pain and to provide a single-index measure of health-related quality of life (HRQoL). This scoping review aims to describe how the VAS has been used for health state valuation in the published literature. METHODS: The search was carried out in Medline, Web of Science and PsycInfo. The findings of the included articles were tabulated and presented descriptively using frequencies and proportions. RESULTS: The database search yielded 4856 unique articles, out of these, 308 were included. In 83% of the articles, the main purpose for using a VAS was to value health states. The two most common perspectives when valuing health states with a VAS were hypothetical (44%) and own health (34%). Some (n = 14) articles used the VAS in the context of economic evaluations, including calculating quality-adjusted life years (QALYs). A large variation in the design of the VAS was found, including the description of the lower and upper anchors. Advantages and disadvantages with using a VAS were mentioned in 14% of the included articles. CONCLUSION: The VAS has been a common method for valuing health states, both as a stand-alone method and in combination with other valuation methods. Despite its widespread use, the design of the VAS has been inconsistent which makes comparison of results across studies challenging. Further research on the role of using the VAS in economic evaluations is warranted.

'Like holding the axe on who should live or not': adolescents' and adults' perceptions of valuing children's health states using a standardised valuation protocol for the EQ-5D-Y-3L.

PURPOSE: There is an increasing interest for using qualitative methods to investigate peoples' cognitive process when asked to value health states. A standardised valuation protocol for the EQ-5D-Y-3L instrument was recently developed. Little is known regarding how people think, reason, and feel when asked to value health states for children. The aim was to explore how adolescents and adults perceive the task of valuing children's health states using the standardised valuation protocol. METHODS: This was a qualitative study where adults (n = 10) and adolescents (n = 10) from the general population participated in individual video-interviews. Initially, participants reported their own health with the EQ-5D-3L instrument. Then they were asked to complete several valuations tasks for a 10-year-old child according to the standardised valuation protocol, followed by a semi-structured interview with open-ended questions to further explore participants' perceptions. A qualitative content analysis was performed. RESULTS: The two main categories that emerged from the data were 'Thoughts and feelings when valuing children's health states' and 'Strategies when valuing children's health states'. Participants expressed feeling doubt, awfulness and being reluctant to trade-off life years, and questioned who has the right to value health states for children. Experience and point of view were strategies participants used to complete the valuation tasks. CONCLUSION: The findings from the present study can contribute to the understanding and interpretation of quantitative results where the standardised valuation protocol has been used to derive values for the EQ-5D-Y-3L. Furthermore, results of the study support the feasibility of including adolescents in valuation studies.

Inequality and heterogeneity in health-related quality of life: findings based on a large sample of cross-sectional EQ-5D-5L data from the Swedish general population.

PURPOSE: This study aimed to investigate inequality and heterogeneity in health-related quality of life (HRQoL) and to provide EQ-5D-5L population reference data for Sweden. METHODS: Based on a large Swedish population-based survey, 25,867 respondents aged 30‒104 years, HRQoL is described by sex, age, education, income, economic activity, health-related behaviours, self-reported diseases and conditions. Results are presented by EQ-5D-5L dimensions, respondents rating of their overall health on the EQ visual analogue scale (EQ VAS), VAS index value and TTO (time trade-off) index value allowing for calculation of quality-adjusted life years (QALYs). Ordinary Least Squares and multivariable logistic regression analyses were used to study inequalities in observed EQ VAS score between socioeconomic groups and the likelihood to report problems on the dimensions, respectively, adjusted for confounders. RESULTS: In total, 896 different health states were reported; 24.1% did not report any problems. Most problems were reported with pain/discomfort. Women reported worse HRQoL than men, and health deteriorated with age. The strongest association between diseases and conditions and EQ VAS score was seen for depression and mental health problems. There was a socioeconomic gradient in HRQoL; adjusting for health-related behaviours, diseases and conditions slightly reduced the differences between educational groups and income groups, but socioeconomic inequalities largely remained. CONCLUSION: EQ-5D-5L population reference (norms) data are now available for Sweden, including socioeconomic differentials. Results may be used for comparisons with disease-specific populations and in health economic evaluations. The observed socioeconomic inequality in HRQoL should be of great importance for policy makers concerned with equity aspects.

Acceptability of the health-related quality of life instrument EQ-5D-Y-5L among patients in child and adolescent psychiatric inpatient care.

AIM: The generic EuroQol 5 Dimensions Youth 5 Level (EQ-5D-Y-5L) measures health-related quality of life among children from 8 years. Respondents report their health on five dimensions with five severity levels and rate their overall health on a visual analogue scale (EQ VAS). The aim of the study was to explore acceptability of the EQ-5D-Y-5L instrument among patients in child and adolescent psychiatric inpatient care. METHODS: A convenience sample of patients within a psychiatric inpatient care clinic in Region Stockholm, Sweden, was used. Follow-up questions were answered directly after filling in the EQ-5D-Y-5L. Conventional qualitative content analysis was chosen to analyse the open-ended questions on how they perceived answering the instrument. RESULTS: In total, 52 patients (83% girls), mean age 15.4 years (range 13-17), were included. Three themes emerged: generic content of the EQ-5D-Y-5L descriptive system; design and wording of the EQ-5D-Y-5L descriptive system and the EQ VAS; self-reporting health with the EQ-5D-Y-5L descriptive system and the EQ VAS. CONCLUSION: The inclusion of physical health dimensions was perceived as positive, but some patients considered the descriptive system too generic. The results indicate that these patients in general could self-report their health in a meaningful way with the EQ-5D-Y-5L instrument.

EQ-5D-Y-5L as a patient-reported outcome measure in psychiatric inpatient care for children and adolescents - a cross-sectional study.

BACKGROUND: Psychiatric disorders have a major individual and societal impact. Until now, the association between health-related quality of life and physical disorders has been far more investigated than the association with psychiatric disorders. Patient-reported outcome measures makes it possible to capture the patient perspective to improve treatments and evaluate treatment outcomes. The aim of this study is to measure health-related quality of life with the EQ-5D-Y-5L among patients in child and adolescent psychiatric inpatient care and to test the instrument's psychometric properties in terms of feasibility and construct validity. METHODS: Data were collected at the child and adolescent psychiatric inpatient facility in Region Stockholm. A questionnaire including the EQ-5D-Y-5L instrument, the Strengths and Difficulties Questionnaire with an impact supplement and a self-rated health question, was administered for self-completion using paper and pencil, with an interviewer present. The Chi-square test was used to investigate differences in proportion of reported problems in the EQ-5D-Y-5L dimensions and the Mann-Whitney U test was used for differences in mean EQ VAS scores. Feasibility was assessed by investigating proportion of missing and ambiguous answers and Spearman's and Pearson's correlation were used to examine construct validity. RESULTS: In total 52 adolescents participated in the study and the majority were girls. The most common diagnosis at admission was depressive episode/recurrent depressive disorder. All participants reported problems on at least one dimension. Most problems were reported in the dimension 'feeling worried, sad or unhappy', where 64% reported severe or extreme problems. Mean EQ VAS score was 29.2. Feasibility was supported and construct validity indicated as some of the hypothesised correlations between the EQ-5D-Y-5 L and the Strengths and Difficulties Questionnaire were found, however, for 'doing usual activities' and 'having pain or discomfort' the correlations were weaker than hypothesised. CONCLUSIONS: This is the first study where the newly developed EQ-5D-Y-5L instrument has been used in psychiatric inpatient care for youth. Participants reported problems in all severity levels in most of the EQ-5D-Y-5L dimensions; mean EQ VAS score was considerably low. Feasibility of the EQ-5D-Y-5L was supported, however other psychometric properties need to be further tested in a larger sample.

Whom should we ask? A systematic literature review of the arguments regarding the most accurate source of information for valuation of health states.

PURPOSE: To determine and critically evaluate the arguments in the published literature regarding the most accurate source of information for valuation of health states: values based on experienced health states (patient values) or values based on described health states (general public values).

EQ-5D-Y-5L: developing a revised EQ-5D-Y with increased response categories.

PURPOSE: EQ-5D-Y is a generic measure of health status for children and adolescents aged 8-15 years. Originally, it has three levels of severity in each dimension (3L). This study aimed to develop a descriptive system of EQ-5D-Y with an increased number of severity levels and to test comprehensibility and feasibility. METHODS: The study was conducted in Germany, Spain, Sweden and the UK. In Phase 1, a review of existing instruments and focus group interviews were carried out to create a pool of possible labels for a modified severity classification. Participants aged 8-15 rated the severity of the identified labels in individual sorting and response scaling interviews. In Phase 2, preliminary 4L and 5L versions were constructed for further testing in cognitive interviews with healthy participants aged 8-15 years and children receiving treatment for a health condition. RESULTS: In Phase 1, a total of 233 labels was generated, ranging from 37 (UK) to 79 labels (Germany). Out of these, 7 to 16 possible labels for each dimension in the different languages were rated in 255 sorting and response scaling interviews. Labels covered an appropriate range of severity on the health continuum in all countries. In Phase 2, the 5L version was generally preferred (by 68-88% of the participants per country) over the 4L version. CONCLUSIONS: This multinational study has provided a version of the EQ-5D-Y with 5 severity levels in each dimension. This extended version (EQ-5D-Y-5L) requires testing its psychometric properties and its performance compared to that of the original EQ-5D-Y-3L.

Population health status based on the EQ-5D-Y-3L among adolescents in Sweden: Results by sociodemographic factors and self-reported comorbidity.

PURPOSE: The EQ-5D-Y-3L is a generic health-related quality of life (HRQoL) measure developed for youth from 8 years old. The aim of this study is to present population health status, based on the EQ-5D-Y-3L, among adolescents in Sweden, by sex, age, self-reported comorbidity and parents' occupational status. METHODS: Data were obtained from a cross-sectional total survey among students, aged 13-18 years, in a Swedish County year 2014. The survey included EQ-5D-Y-3L, questions regarding self-reported health, disease, functional impairment and mental distress. Parents' occupational status was used as a proxy for socio-economic status. RESULTS: A total of 6574 participants answered all the EQ-5D-Y-3L dimensions (mean age was 15.9 years, same proportion of boys and girls). Girls reported more problems than boys in the dimensions 'doing usual activities', 'having pain or discomfort' and 'feeling worried, sad or unhappy', and lower mean VAS score. Respondents with one or both parents unemployed reported more problems with usual activities, pain/discomfort and in the mood dimension than those with both parents employed. Those with comorbidity had in general more problems in all dimensions and lower mean VAS score. The highest impact on VAS score was found for adolescents who reported that they always felt depressed. CONCLUSIONS: Sex, age, self-reported comorbidity and parents' occupational status were associated with HRQoL determined by the EQ-5D-Y-3L in the general population of adolescents. The ability of EQ-5D-Y-3L to distinguish adolescents' health status based on these factors confirms the instrument's usefulness in assessment of HRQoL and as guidance for prioritization.

Measuring health-related quality of life with the EQ-5D-Y instrument in children and adolescents with asthma.

AIM: Asthma is one of the most common chronic paediatric diseases worldwide and affects different dimensions of health-related quality of life. This study tested the feasibility and convergent validity of using the EQ-5D-Y instrument on children and adolescents with asthma. METHODS: A cross-sectional design was chosen, and children with asthma, aged from 8 to 16 years, were recruited from clinics in Stockholm, Sweden. To test convergent validity, the EQ-5D-Y instrument was combined with the Paediatric Quality of Life Questionnaire. RESULTS: The EQ-5D-Y proved feasible as nearly 96% of the 94 respondents completed all items on the questionnaire. High and moderate correlations between the two instruments were found for the dimensions of 'doing usual activities' and 'activity limitations' and for 'having pain or discomfort' and 'symptoms'. The visual analogue scale of the ED-5D-Y correlated with the Paediatric Quality of Life Questionnaire total score and the self-rated health question. The dimensions on the EQ-5D-Y with most reported problems were 'usual activities', 'pain or discomfort' and 'worried, sad or unhappy'. CONCLUSION: The EQ-5D-Y instrument seemed to provide feasibility and convergent validity for measuring health-related quality of life in children and adolescents with asthma.

Did Stress Prevalence Among Adolescents in Scandinavia Change from 2000 to 2019? A literature review.

Background: Prolonged stress is a risk factor for developing mental illness and stress-related diseases. As there has been an increase in self-reported psychological symptoms and diagnosis of mental illness among Scandinavian adolescents, more knowledge of stress prevalence in this age group is needed. Aim: This literature review will investigate a possible increase in stress prevalence among Scandinavian adolescents, aged 13-18, between the years 2000 and 2019. Methods: A systematic literature search was conducted in the PubMed and PsycInfo databases. In addition, a grey literature search was conducted to find relevant surveys and reports. Altogether, nine papers and nine surveys, and reports containing relevant data were identified, assessed for risk of bias, and included in the analysis. Results: The results show higher stress scores among the older participants in the age group 13-18 years and a gender difference, where girls score higher than boys. The literature neither supports nor rejects the hypothesis that stress levels have increased among adolescents in Scandinavia, from year 2000 to 2019. Only two of the included studies used a validated stress questionnaire and there was a substantial risk of non-response bias. Therefore, the existing literature is considered insufficient to determine if there has been an increase in stress over time. A majority of the papers, surveys, and reports had moderate risk of bias. Conclusions: Further research using validated stress questionnaires in representative populations is needed to investigate changes in stress prevalence among Scandinavian adolescents. Also, the age and gender difference in stress prevalence among 13-18-year-olds may be of relevance for planning preventive interventions to reduce stress.

Exploring EQ-5D-Y-3L Experience-Based VAS Values Derived Among Adolescents.

OBJECTIVES: The EQ-5D-Y-3L is a generic health-related quality of life (HRQoL) instrument, developed from the adult version to be suitable for children and adolescents aged 8-15 years. To derive values for the EQ-5D-Y-3L different valuation methods and perspectives have been applied. The aim of this study was to explore EQ-5D-Y-3L experience-based visual analogue scale (VAS) values derived among adolescents. METHODS: Data were derived from a cross-sectional population survey administered via schools in 2014 to adolescents aged 13-18 years, in Sweden. Regression analyses were performed on individual data with the VAS value as dependent variable. Ordinary least-squares (OLS) and generalised linear models (GLM) were estimated with two dummy variables for each of the EQ-5D-Y-3L dimensions. Interaction variables were tested. One way of anchoring VAS at dead and full health by using the predicted values for worst and best health states defined by the EQ-5D-Y-3L descriptive system was explored. RESULTS: Of the 243 possible health states in EQ-5D-Y-3L, 92 were reported by the 6,468 respondents. The largest decrements in VAS values were observed for the dimension 'feeling worried, sad or unhappy' followed by 'doing usual activities'. All models performed similarly in terms of monotonicity and goodness of fit but in terms of simplicity and understandability, the OLS main effect model was superior. CONCLUSIONS: We have explored experience-based VAS values for the EQ-5D-Y-3L derived among adolescents. The findings suggest that it is possible for adolescents to value their own health state using the VAS, which makes it possible to capture aspects that are important for young people.