Identifying potential themes for the Child Amblyopia Treatment Questionnaire

A semi-structured interview to capture manual wheelchair use for mobility activities among individuals with spinal cord injury in real-life situations: development and content validity of the Wheelchair Mobility Activity Log (WC-MAL)

STUDY DESIGN

Mixed-method approach.

OBJECTIVES

To develop and assess the content validity of a semi-structured interview that captures the lived experience of using a manual wheelchair among individuals with SCI in the real world, the Wheelchair Mobility Activity Log (WC-MAL).

SETTING

SCIR-Group (UDESC)/Brazil.

METHODS

Developing the WC-MAL comprised five steps: (1) defining the construct-based on the International Classification of Functioning, Disability and Health (ICF); (2) identifying relevant activities from other assessment instruments and interviews with the end-users (14 Individuals with SCI and 13 rehabilitation professionals); (3) Selecting the items - activities were linked to ICF codes and grouped into sets; (4) developing the scoring scales based on interviews with the end-users; and, (5) evaluating content validity in accordance with the COnsensus-based Standards for the selection of health Measurement INstruments (COSMIN). The content validity ratio (CVR) for each item and scale and the overall instrument content validity index (CVI) were calculated.

RESULTS

From an initial draft of 295 activities identified, a set of 222 activities was linked to the ICF domain of "Mobility (d4)" and further refined to generate the 23 items in the WC-MAL. Three scales were developed to assess Frequency (how often), Performance (how well), and Assistance (assistance needed) levels. The items and scales showed a CVR superior to the critical value established (≥0.64). The general CVI value was 0.96.

CONCLUSION

The WC-MAL is a promising clinical instrument with adequate content validity to assess the spontaneous use of the manual wheelchair in the real world among individuals with SCI.

Constructing country-specific quality-of-life item banks for adults with amblyopia and strabismus in Australia and India

CLINICAL RELEVANCE

Understanding the quality-of-life (QoL) impacts of amblyopia and strabismus from the perspectives of patients using validated tools would enable eye care practitioners to provide better clinical management.

BACKGROUND

Item banks are advanced patient reported outcome measures with several advantages over traditional QoL assessment. This paper describes the development of amblyopia and strabismus-specific QoL item banks for two distinct country settings: Australia (high-income) and India (low-middle income) and examines the unique QoL issues.

METHODS

Using a bottom-up systematic approach, the content for the item banks was identified from three sources: existing self-report amblyopia and strabismus questionnaires (n = 22), qualitative literature (n = 5) and prospective qualitative studies in Australia (n = 49) and India (n = 30). The initial item pool underwent item evaluation, construction, and pre-testing to form optimal sets of representative items. The Indian item pools were first developed in English and translated into Hindi and Tamil using a rigorous translation protocol. The differences in QoL experiences that emanated from the qualitative studies and the number of common and unique items in the final item pools were compared.

RESULTS

The final Australian and Indian item pools comprised 312 and 277 items, respectively, covering 11 QoL domains. Two hundred and sixty items (79%) were common to both countries, and 21% were unique. Of the 11 domains, except for activity limitation (64.5%), visual symptoms (73.3%) and emotional impact (75.5%) domains, all other domains had over 80% of items common to both countries. The unique items can be attributed to differences in QoL experiences, individual perspectives, culture, lifestyle, country setting and health systems.

CONCLUSION

Amblyopia has a multifaceted impact on QoL irrespective of the country settings. Despite a huge overlap in QoL impacts between Australia and India, both countries had unique issues, especially activity limitations. The study developed comprehensive, country-specific item pools for Australia and India.

Qualitative Exploration of the Visual Function Impairments and Health-Related Quality of Life Impacts of Amblyopia in Adult and Pediatric Populations

INTRODUCTION

Amblyopia is a reduction in vision in one or both eyes due to impaired development of the visual pathway. This study explored the experience of amblyopia and treatment from the patient, caregiver, and clinician perspectives.

METHODS

A targeted literature review, including a review of social media listening (SML) studies, was conducted. Next, qualitative interviews were conducted with amblyopia patients, caregivers of children with amblyopia, and ophthalmologists with experience treating patients with amblyopia. The findings informed the development of a disease model. Amblyopia clinical experts provided input at key stages.

RESULTS

Twelve data sources were reviewed, including qualitative studies in the literature and SML studies. Overall, 133 patients/caregivers were interviewed (23 adults, 16 adolescents, 47 child-caregiver dyads), plus 10 ophthalmologists from the United States, France, and Germany. Reduced visual acuity, impaired depth perception, impaired peripheral vision, and double vision were the most frequently reported symptoms. Amblyopia impacted daily activities (reading, using digital devices), the ability to move around, school/work (productivity, seeing the board in class), emotional well-being (frustration, sadness), and social functioning (difficulty socializing). Treatments, including patching and corrective lens, also impacted daily activities (using digital devices, sports/leisure), mobility (bumping into things), and work/school (tasks taking longer) as well as emotional well-being (embarrassment), and social functioning (bullying/stigma).

CONCLUSION

The findings contribute valuable insights into the adult and pediatric experience of amblyopia from a multi-stakeholder perspective. The findings were used to critically assess existing clinical outcome assessments and supported the development of patient- and observer-reported outcome measures for use in amblyopia clinical trials.

Including Young Children in the Development and Testing of Patient Reported Outcome (PRO) Instruments: A Scoping Review of Children's Involvement and Qualitative Methods

BACKGROUND

Qualitative research during the development/testing of Patient Reported Outcome Measures (PROMs) is recommended to support content validity. However, it is unclear if and how young children (≤ 7 years) can be involved in this research because of their unique cognitive needs.

OBJECTIVES

Here we investigate the involvement of children (≤ 7 years) in qualitative research for PROM development/testing. This review aimed to identify (1) which stages of qualitative PROM development children ≤ 7 years had been involved in, (2) which subjective health concepts had been explored within qualitative PROM development with this age group, and (3) which qualitative methods had been reported and how these compared with existing methodological recommendations.

METHODS

This scoping review systematically searched three electronic databases (searches re-run prior to final analysis on 29 June 2022) with no date restrictions. Included studies had samples of at least 75% aged ≤ 7 years or reported distinct qualitative methods for children ≤ 7 years in primary qualitative research to support concept elicitation or PROM development/testing. Articles not in English and PROMs that did not enable children ≤ 7 years to self-report were excluded. Data on study type, subjective health and qualitative methods were extracted and synthesised descriptively. Methods were compared with recommendations from guidance.

RESULTS

Of 19 included studies, 15 reported concept elicitation research and 4 reported cognitive interviewing. Most explored quality of life (QoL)/health-related quality of life (HRQoL). Some concept elicitation studies reported that creative/participatory activities had supported children's engagement, but results and reporting detail varied considerably across studies. Cognitive interviewing studies reported less methodological detail and fewer methods adapted for young children compared with concept elicitation studies. They were limited in scope regarding assessments of content validity, mostly focussing on clarity while relevance and comprehensiveness were explored less.

DISCUSSION

Creative/participatory activities may be beneficial in concept elicitation research with children ≤ 7 years, but future research needs to explore what contributes to the success of young children's involvement and how researchers can adopt flexible methods. Cognitive interviews with young children are limited in frequency, scope and reported methodological detail, potentially impacting PROM content validity for this age group. Without detailed reporting, it is not possible to determine the feasibility and usefulness of children's (≤ 7 years) involvement in qualitative research to support PROM development and assessment.

The Amblyopia Quality of Life (AmbQoL): Development and Content Validation of a Novel Health-Related Quality of Life Instrument for Use in Adult and Pediatric Amblyopia Populations

INTRODUCTION

Amblyopia is a neurodevelopmental vision disorder, characterized by poor vision in one or both eyes. Given the lack of existing clinical outcome assessments (COA) considered fit-for-purpose for amblyopia clinical trials, this study developed new COAs to assess amblyopia symptoms and health-related quality of life (HRQoL) impacts in adult and pediatric amblyopia populations that conform with best practice standards and regulatory guidelines.

METHODS

Findings from a targeted qualitative literature review informed the development of three versions of the new Amblyopia Quality of Life Questionnaire (AmbQoL): a patient-reported outcome measure (PRO) for individuals aged 13 years and older, a PRO for children aged 9-12 years, and an observer-reported outcome measure (ObsRO) for caregivers of children aged 4-8 years. Qualitative interviews were conducted with the target populations, and with ophthalmologists experienced in treating amblyopia patients to evaluate the content validity for further development of the AmbQoL. A translatability assessment was conducted to ensure cultural appropriateness and usability across multiple languages. Feedback from Food and Drug Administration (FDA) was also sought on the instruments, and clinical experts provided input at key stages.

RESULTS

Interviews were conducted with 112 patients/caregivers and ten ophthalmologists from the USA, France, and Germany. The instructions, items, and response options were well understood across all AmbQoL versions. Feedback from the patients, caregivers, ophthalmologists, the translatability assessment, the FDA, and the expert clinicians informed minor wording modifications to enhance clarity and translatability. Some items were removed due to low relevance. The study resulted in a 23-item adult/adolescent PRO, 24-item child PRO, and 12-item ObsRO, each employing a 7-day recall period.

CONCLUSION

Each AmbQoL version has documented support for its face and content validity for use in amblyopia populations aged ≥ 4 years. Further research is necessary to evaluate the psychometric measurement properties of the AmbQoL instruments to enable their use in amblyopia treatment trials.

Adverse Influences of Nonstrabismic Amblyopia on Quality of Life of Teenagers in China

The aim of this study was to explore the influences of nonstrabismic amblyopia on quality of life in adolescents. Health-related quality of life (HRQoL) scale, a multidimensional construct that indicates a fundamental health outcome, was used to measure physical and psychosocial functioning of the adolescents. Forty teenagers with nonstrabismic amblyopia and 40 control teenagers without nonstrabismic amblyopia were recruited between April 2019 and July 2021. The anthropometric measures, body image, physical activity outcome, and HRQoL scores including physical health, emotional functioning, social functioning, and school functioning were compared between the two groups. The results revealed that teenagers with nonstrabismic amblyopia had less weekly sedentary time (P < 0.001), weekly total steps (P < 0.001), and worse school functioning (P = 0.0211) than control teenagers. No significant difference was found in anthropometric measures and body image between the two groups (P > 0.05). This study implied the needs for teenagers with nonstrabismic amblyopia to enhance physical activities. Teachers and parents are encouraged to pay more attention to teenagers with nonstrabismic amblyopia to improve their school functioning.

Quality of life during occlusion therapy for amblyopia from the perspective of the children and from that of their parents, as proxy

BACKGROUND

Parents pity their amblyopic child when they think that they suffer from occlusion therapy. We measured health-related quality of life during occlusion therapy.

METHODS

We developed the Amblyopia Parents and Children Occlusion Questionnaire (APCOQ). It was designed by a focus group of patients, orthoptists and ophthalmologists and consisted of twelve items concerning skin contact of patch, activities, contact with other children, emotions and awareness of necessity to patch. Parents filled out the Proxy Version shortly before the Child Version was obtained from their child. Child Version item scores were compared with Proxy Version item scores and related to the child's age, visual acuity, refraction, angle of strabismus, and cause of amblyopia.

RESULTS

63 children were recruited by orthoptists, and their parents agreed to participate. Three children were excluded: one child with Down-syndrome, one child with cerebral palsy, and one child who had been treated by occlusion therapy. Included were 60 children (mean age 4.57 ± 1.34 SD) and 56 parents. Children had occluded 128 ± 45 SD days at interview. Prior to occlusion, 54 children had worn glasses. Cronbach's α was 0.74 for the Child Version and 0.76 for the Proxy Version. Children judged their quality of life better than their parents did, especially pertaining to skin contact and activities like games and watching TV. Notably, 13 children with initial visual acuity ≥ 0.6 logMAR in the amblyopic eye experienced little trouble with games during occlusion. Quality of life in eight children with strabismus of five years and older correlated negatively (Spearman rank mean rho = -0.43) with angle of strabismus. Children with amblyopia due to both refractive error and strabismus (n = 14) had, relatively, lowest quality of life, also according to their parents, as proxy. Several children did not know why they wore a patch, contrary to what their parents thought.

CONCLUSIONS

Children's quality of life during occlusion therapy is affected less than their parents think, especially regarding skin contact, playing games and watching TV during occlusion. Quality of life correlates negatively with the angle of strabismus in children five years and older. Children do not know why they wear a patch, contrary to what their parents think. Notably, children with low visual acuity in the amblyopic eye, had little difficulty playing games.

Does non-strabismic amblyopia affect the quality of life of adults? Findings from a qualitative study

PURPOSE

While much is known about the psychosocial impacts of strabismus, little is known about the effects of non-strabismic amblyopia on quality of life (QoL). The aim of this study was to explore the long-term impacts of anisometropic amblyopia.

METHODS

A phenomenological qualitative investigation was carried out on a sample of adults with anisometropic amblyopia. Subjects participated in in-depth telephone interviews and described how their eye condition affected different aspects of their life. The interviews were audio-recorded, transcribed verbatim and analysed iteratively to form emergent themes.

RESULTS

Sixteen participants took part in the study (median age: 21.5 years; range: 18-36 years; 11 male and 5 female). Six themes emerged: (1) symptoms experienced by participants, (2) concerns and apprehensions, (3) emotional impacts, (4) activity limitations, (5) hassle and inconveniences and (6) economic and career implications. Symptoms reported by participants ranged from glare to difficulty concentrating. They were extremely concerned about the safety of their better eye and lived with several doubts and anxieties. Negative emotions such as grief and disappointment due to eye care negligence in childhood was apparent. Guilt and regretful feelings were present in those who did not comply with past treatment. Participants expressed several limitations in driving, reading, mobility (e.g., using stairs) and tasks requiring high resolution. Reported inconveniences associated with coping with their eye condition included having to travel across the country in search of a cure for their amblyopia. Economic impacts ranged from costs associated with accessing eye care and management to career choices being compromised.

CONCLUSION

Lived experiences of people with anisometropic amblyopia indicate that the QoL impacts are multifaceted and substantial, even in the absence of strabismus. The results have the potential to influence patient-practitioner relationship by opening newer horizons to communication and care while managing adult amblyopes.

Engaging the Voices of Children: A Scoping Review of How Children and Adolescents Are Involved in the Development of Quality-of-Life-Related Measures

OBJECTIVES

Patient-reported outcomes are increasingly recommended to guide patient care, develop and evaluate interventions, and modify health systems. However, not enough is known about whether and how children and adolescents, as "experts" in their own health and quality of life (QoL), are being engaged in the development of instruments. Our goals in this review were (1) to identify all QoL-related instruments that have included children and/or adolescents in the development of questionnaire content, including identification of themes and items; and (2) to report how this was done; and (3) to highlight those that used qualitative methods.

METHODS

MEDLINE and Embase were searched for child- or adolescent-completed QoL-related instruments, supplemented by hand-searching of relevant reviews until 2020. Original development papers were identified and retrieved when possible, from which instrument characteristics and details of qualitative development methods were extracted.

RESULTS

We identified 445 instruments, of which 88 used qualitative methods for content development. Interviews and focus groups were the most common methods. A variety of play techniques were used to engage the child and adolescent participants. The specific criteria for the inclusion of children and adolescents (age, developmental stage, duration, and nonclinical location) varied considerably.

CONCLUSIONS

Researchers frequently involve children and adolescents in qualitative methods when developing QoL-related measures; however, there is little information about the methods used. Better reporting of methodology, improved dissemination of methods guidelines, and research into optimal ways of including children and adolescents in the process of instrument development would be useful.

Development of a New Quality of Life Measure for Duchenne Muscular Dystrophy Using Mixed Methods: The DMD-QoL

Objective

Based on concerns about existing patient-reported outcome measures (PROMs) for assessing quality of life (QoL) in Duchenne muscular dystrophy (DMD), we describe the mixed methods development of a new QoL PROM for use in boys and men with DMD: the DMD-QoL.

Methods

The DMD-QoL was developed in 3 stages. First, draft items were generated from 18 semistructured qualitative interviews with boys and men with DMD, analyzed using framework analysis. Second, cognitive debriefing interviews with patients (n = 10), clinicians (n = 8), and patients' parents (n = 10) were undertaken, and a reduced item set was selected and refined. Third, psychometric data on the draft items from a cross-sectional online survey (n = 102) and stakeholder input from patients and patients' parents were used to produce the final questionnaire. Patient and public involvement and engagement was embedded throughout the process.

Results

From an initial draft of 47 items, a revised set of 27 items was produced at stage 2, and this set was further refined at stage 3 to generate the DMD-QoL, a 14-item QoL PROM. The DMD-QoL is designed for use from 7 years of age by proxy report and from 10 years of age by self-report or proxy report. The final measure showed good psychometric properties.

Conclusion

The DMD-QoL is a new 14-item QoL PROM for boys and men with DMD, with demonstrable content and face validity.

Clinical investigation plan for the use of interactive binocular treatment (I-BiT) for the management of anisometropic, strabismic and mixed amblyopia in children aged 3.5-12 years: a randomised controlled trial

Background

Amblyopia (lazy eye) affects the vision of approximately 2% of all children. Traditional treatment consists of wearing a patch over their ‘good’ eye for a number of hours daily, over several months. This treatment is unpopular and compliance is often low. Therefore, results can be poor. I-BiT is a system, based on stereo technology using shutter glasses, designed to treat amblyopia using dichoptic stimulation. This trial uses a redesigned system for home use and includes eye-tracking capability.

Methods/design

This is a randomised controlled trial involving three groups of 40 patients each, aged between 3.5 and 12 years, with a diagnosis of (1) anisometropic amblyopia, (2) mixed or strabismic amblyopia prior to strabismic surgery and (3) mixed or strabismic amblyopia who have just undergone strabismus surgery. They will be randomised in a 1:1 ratio between I-BiT and control and will receive treatment, at home over a 6-week period. Their visual acuity will be assessed independently at baseline, mid-treatment (week 3), at the end of treatment (week 6) and, for those receiving the active I-BiT treatment, 4 weeks after completing treatment (week 10).

The primary endpoint will be the change in visual acuity from baseline to the end of treatment. Secondary endpoints will be additional visual acuity measures, patient acceptability, compliance and the incidence of adverse events.

Discussion

This is a randomised controlled trial using the redesigned I-BiT™ system to determine if this is a feasible treatment strategy for the management of anisometropic, strabismic and mixed amblyopia.

Trial registration

ISRCTN Number/Clinical trials.gov, ID: NCT02810847. Registered on 23 June 2016.

Electronic supplementary material

The online version of this article (10.1186/s13063-019-3523-0) contains supplementary material, which is available to authorized users.

Comparison of the CAT-QoL and PedsQLTM instruments in measuring quality of life in amblyopia treatment: preliminary results

Background/Aims: The Child Amblyopia Treatment Questionnaire (CAT-QoL) is a patient-reported outcome measure (PROM), designed to assess the impact of amblyopia treatment. The aim of this study was to compare the psychometric properties of two PROMs; the CAT-QoL instrument and Pediatric Quality of Life Inventory (PedsQL^TM), a generic pediatric PROM. This work was part of a wider project to develop a condition-specific PROM for children with amblyopia. Methods: Three hundred and forty-two participants were recruited in a UK multi-center study. Quality of life data was collected using the CAT-QoL and the PedsQL^TM instruments. The psychometric performance of the CAT-QoL and PedsQL^TM were examined in terms of acceptability, reliability, and validity. Results: Both instruments demonstrated good reliability (CAT-QoL Cronbach's α = 0.793; PedsQL^TM α = 0.872). The convergent validity of the CAT-QoL and PedsQL^TM instruments was tested by comparing the instruments to each other. There was a moderate correlation between the PedsQL^TM and the CAT-QoL scores, and this relationship was statistically significant (r_s = -0.517, p < .000). No statistical significance was found between the level of amblyopia severity and the mean PedsQL^TM score (p = .420). Conclusion: It was possible to assess the impact of amblyopia treatment using the CAT-QoL and PedsQL^TM instruments. The preliminary findings from this are not conclusive, and it is not possible to advocate the use of one questionnaire over another based upon psychometric performance demonstrated here. This may be due to the sample population, as there were limited numbers of participants with severe amblyopia. Both the CAT-QoL and PedsQL^TM instruments were noted to have some issues with ceiling effects at an individual item level. The CAT-QoL and PedsQL^TM were reliable (as determined by Cronbach's alpha). The PedsQL^TM instrument was not able to discriminate between amblyopia severity groups (discriminant validity). Further research is required to formally assess the psychometric properties of the CAT-QoL questionnaire.

Refinement of the Child Amblyopia Treatment Questionnaire (CAT-QoL) using Rasch analysis

Aims or Purpose: The Child Amblyopia Treatment Questionnaire (CAT-QoL) was developed using a "bottom-up" methodological approach. Interviews with children with amblyopia identified items (questions) and response levels to be tested in a draft questionnaire consisting of 11 items (sad, feeling on face, hurt, doing schoolwork, cross, how other children treat you, doing things, worried, upset with family, playing with friends, happy). This study describes the refinement of the descriptive system for the CAT-QoL instrument using the application of Rasch analysis. Methods: A multi-centre pilot study was conducted, and data collected from 342 participants. Participants were asked to self-complete the appropriate treatment version of the CAT-QoL questionnaire socio-demographic and clinical data were collected by the clinician using a standardised proforma. A "measure" of child's health was obtained from the parent by asking how they would rate their child's health over the previous week. Rasch analysis techniques were applied to refine the questionnaire. Rasch was used to examine response categories and collapse item response levels, identify poorly performing items, and explore local dependency of items. Results: A total of 331 subjects were included in the study sample, however only 315 were accepted into the RUMM program as a number of subjects had missing questions responses on the CAT-QoL. RUMM also excluded a further 41 subjects as these demonstrated extreme responses. Disordered response categories were found for each item, requiring adjacent response levels to be combined. This was applied to all items, and the model fit was re-examined. Two items were found to have poor fit (cross and happy) and were removed from the measure and the model fit was re-examined. No statistically significant differential item functioning (DIF) was found for any item, using person factors of age, sex or general health. Two items showed some dependency (worried and upset with family), and the poorer fitting item was subsequently removed (upset with family). This resulted in a refined CAT-QoL instrument that consists of 8-items, each with three-level response scales. Conclusion: The refined CAT-QoL instrument includes the following items: sad, feeling on face, hurt, doing work at school, how other children treat you, doing things, worried and playing with friends. The CAT-QoL can be Rasch scored, with a range of 0-16 where a greater value indicates a worse quality of life (or greater impact of treatment on the individual). The CAT-QoL may be useful in determining how amblyopia treatment affects children, and offers an alternative to generic patient reported outcome measures.

Development of Pediatric Eye Questionnaires for Children With Eye Conditions

PURPOSE

To develop patient-derived Pediatric Eye Questionnaires (PedEyeQ) to separately assess eye-related quality of life (ER-QOL) and functional vision in children with eye conditions.

DESIGN

Questionnaire development study.

METHODS

A total of 444 children (0 to <18 years old), across 10 diagnostic categories, were enrolled at 2 sites. All parents (n = 444) and 277 children (5 to <18 years old) completed master questionnaires, developed from patient-derived concerns. Factor analysis was performed to identify unidimensional domains (eigenvalue >1.0) and Rasch analyses (differential item functioning, targeting, fit) to reduce items (separate analyses for subjects aged 0-4, 5-11, and 12-17 years and for each factor).

RESULTS

The Child 5- to 11-year-old PedEyeQ consisted of 4 unidimensional domains/questionnaires: functional vision, bothered by eyes/vision, social, frustration/worry (10 items each). The Child 12- to 17-year-old PedEyeQ consisted of the same 4 domains (total 39 items). The Proxy 0- to 4-year-old PedEyeQ consisted of 3 questionnaires/domains: functional vision, bothered by eyes/vision, social (total 29 items). The Proxy 5- to 11-year-old PedEyeQ consisted of 5 questionnaires/domains: functional vision, bothered by eyes/vision, social, frustration/worry, eye care (total 39 items), as did the Proxy 12- to 17-year-old PedEyeQ (total 42 items). The Parent PedEyeQ consisted of 4 questionnaires/domains: impact on parent/family, worry regarding child's eye condition, worry regarding child's self-perception and interactions, worry regarding child's visual function (total 35 items). Rasch look-up tables were created for scoring.

CONCLUSIONS

By following a rigorous approach, we have developed Pediatric Eye Questionnaires for separately assessing functional vision and ER-QOL domains in children of any age and with any eye condition.

Producing a preference-based quality of life measure for people with Duchenne muscular dystrophy: a mixed-methods study protocol

INTRODUCTION

Preference-based measures (PBMs) of health-related quality of life (HRQoL) are used to generate quality-adjusted life years, which are necessary for cost-effectiveness evaluations of health interventions via cost-utility analysis. These measures of health can be generic (ie, pandiagnostic) or condition specific. No condition-specific PBM of HRQoL in Duchenne muscular dystrophy (DMD) exists, yet there are concerns that standard generic measures lack the specificity to assess aspects of HRQoL that are especially important to people with DMD. This study has been designed to produce a condition-specific PBM of HRQoL in DMD.

METHODS AND ANALYSIS

This mixed-methods study proceeds through three stages. In the first stage (concept elicitation), semistructured interviews will be conducted with boys and men diagnosed with DMD, and analysed with framework to produce a draft health state descriptive system for HRQoL in DMD. In the second stage (refining the descriptive system), patients, clinicians and primary caregivers of people with DMD will assess the face validity of the descriptive system. This will be followed by a quantitative survey on a larger sample of patients, which will be analysed with psychometric analyses to produce a refined descriptive system. In the third stage (valuation and econometric modelling), an online discrete choice experiment with duration will be administered to a general public sample to generate utility values for the new measure.

ETHICS AND DISSEMINATION

This study has received ethical approval from the National Health Service (REC reference: 18/SW/0055). The primary output of this research will be a condition-specific PBM (or 'bolt-on' to an existing generic PBM) in people with DMD and an associated value set. Results will be disseminated through international conferences and open-access journals.

A review of quality of life themes in Duchenne muscular dystrophy for patients and carers

Duchenne Muscular Dystrophy (DMD) is a severe, life-limiting and incurable condition. However, studies estimating quality of life and those measuring actual quality of life in people living with DMD vary considerably. This discrepancy indicates potential difficulties with assessing quality of life using common generic quality of life instruments in this rare and unique population. This study sought to document the range of themes relevant to quality of life for people with DMD by examining the published literature and additionally to investigate the themes that are relevant to quality of life for carers and the wider family. Eligible studies for the review were primary studies of any study design that reported outcomes or themes relevant to quality of life for either people with DMD, their families, or both. A review of studies identified from searching medical bibliographic sources between 2010 and 2016 found 45 relevant published studies. A thematic framework is proposed to categorise the themes identified into: i. physical; ii. psychological; iii. Social; iv. well-being domains. A final "other" domain was included to encompass themes identified from the literature that are not covered by commonly used quality of life instruments. The rich variety of themes identified from the review highlights that DMD has a complex quality of life profile which is not currently captured by standard quality of life tools that are commonly employed in the healthcare setting. The findings also highlight that the resulting impact on the quality of life of carers and wider family of people with DMD requires consideration.

Development and refinement of the WAItE: a new obesity-specific quality of life measure for adolescents

BACKGROUND

Few weight-specific outcome measures, developed specifically for obese and overweight adolescents, exist and none are suitable for the elicitation of utility values used in the assessment of cost effectiveness.

OBJECTIVES

The development of a descriptive system for a new weight-specific measure.

METHODS

Qualitative interviews were conducted with 31 treatment-seeking (above normal weight status) and non-treatment-seeking (school sample) adolescents aged 11-18 years, to identify a draft item pool and associated response options. 315 eligible consenting adolescents, aged 11-18 years, enrolled in weight management services and recruited via an online panel, completed two version of a long-list 29-item descriptive system (consisting of frequency and severity response scales). Psychometric assessments and Rasch analysis were applied to the draft 29-item instrument to identify a brief tool containing the best performing items and associated response options.

RESULTS

Seven items were selected, for the final item set; all displayed internal consistency, moderate floor effects and the ability to discriminate between weight categories. The assessment of unidimensionality was supported (t test statistic of 0.024, less than the 0.05 threshold value).

CONCLUSIONS

The Weight-specific Adolescent Instrument for Economic-evaluation focuses on aspects of life affected by weight that are important to adolescents. It has the potential for adding key information to the assessment of weight management interventions aimed at the younger population.

Comparison of Rating Scales in the Development of Patient-Reported Outcome Measures for Children with Eye Disorders

BACKGROUND

A rating scale is a critical component of patient-reported outcome instrument design, but the optimal rating scale format for pediatric use has not been investigated. We compared rating scale performance when administering potential questionnaire items to children with eye disorders and their parents.

METHODS

Three commonly used rating scales were evaluated: frequency (never, sometimes, often, always), severity (not at all, a little, some, a lot), and difficulty (not difficult, a little difficult, difficult, very difficult). Ten patient-derived items were formatted for each rating scale, and rating scale testing order was randomized. Both child and parent were asked to comment on any problems with, or a preference for, a particular scale. Any confusion about options or inability to answer was recorded.

RESULTS

Twenty-one children, aged 5-17 years, with strabismus, amblyopia, or refractive error were recruited, each with one of their parents. Of the first 10 children, 4 (40%) had problems using the difficulty scale, compared with 1 (10%) using frequency, and none using severity. The difficulty scale was modified, replacing the word "difficult" with "hard." Eleven additional children (plus parents) then completed all 3 questionnaires. No children had problems using any scale. Four (36%) parents had problems using the difficulty ("hard") scale and 1 (9%) with frequency. Regarding preference, 6 (55%) of 11 children and 5 (50%) of 10 parents preferred using the frequency scale.

CONCLUSIONS

Children and parents found the frequency scale and question format to be the most easily understood. Children and parents also expressed preference for the frequency scale, compared with the difficulty and severity scales. We recommend frequency rating scales for patient-reported outcome measures in pediatric populations.

Patient reported outcome measures for visual impairment after stroke: a systematic review

Purpose

The aim of this review was to identify patient reported outcome measures (PROMs) for use in research and clinical practice involving individuals with visual impairment following stroke and to evaluate their content validity against quality assessment criteria.

Method

A systematic review of the literature was conducted to identify articles related to the development and/or validation of PROMS. We searched scholarly online resources and hand searched journals. Search terms included MESH terms and alternatives relating to PROMs, visual impairments and quality of life. Data were extracted relating to the development and validation of the included instruments. The quality of the development process was assessed using a modified version of a PROM quality assessment tool.

Results

A total of 142 PROMs were identified, 34 vision-specific PROMs were relevant and available to be analysed in this review. Quality appraisal identified four highly rated instruments: the National Eye Institute Visual Functional Questionnaire (NEI-VFQ), Activity Inventory (AI), Daily Living Tasks Dependant on Vision (DLTV) and Veterans Affairs Low Visual Function Questionnaire (VA LV VFQ). The four instruments have only been used with either a limited number of stroke survivors or a sub-population within visual impairment following stroke.

Conclusion

No instruments were identified which specifically targeted individuals with visual impairment following stroke. Further research is required to identify the items which a population of stroke survivors with visual impairment consider to be of most importance. The validation of a combination of instruments or a new instrument for use with this population is required.

Electronic supplementary material

The online version of this article (doi:10.1186/s12955-015-0338-x) contains supplementary material, which is available to authorized users.

Seen and heard: towards child participation in dental research

BACKGROUND

There has been an increasing emphasis in many countries worldwide to capture the views of children on health services and research. A previous systematic review found that most oral health research from 2000 to 2005 was conducted on children and highlighted the need for greater research with children.

AIM

To describe the extent to which oral health research between 2006 and 2014 has been conducted with or on children.

DESIGN

Systematic review. Electronic databases were searched for the literature on child dental health. Each identified paper was examined by two researchers and categorised based on the extent to which children were involved in the research, the type of study (evaluative or otherwise), the country of origin, and the clinical discipline.

RESULTS

The search included 2950 papers after application of the exclusion criteria. Of these, 17.4% were with children, 18.3% involved the use of proxies (parents or clinician), and 64.2% were on children.

CONCLUSIONS

The proportion of studies from 2006 to 2014 involving research with children has increased from 7.3% in 2000-2005. This systematic review provides evidence for movement towards children's involvement in dental research over the last 10 years. Future dental research must focus on incorporating children's perspectives into the evaluation of dental treatments to improve outcomes for children.

Binocular versus standard occlusion or blurring treatment for unilateral amblyopia in children aged three to eight years

BACKGROUND

Current treatments for amblyopia in children, occlusion and pharmacological blurring, have had limited success, with less than two-thirds of children achieving good visual acuity of at least 0.20 logMAR in the amblyopic eye, limited improvement of stereopsis, and poor compliance. A new treatment approach, based on the dichoptic presentation of movies or computer games (images presented separately to each eye), may yield better results, as it aims to balance the input of visual information from each eye to the brain. Compliance may also improve with these more child-friendly treatment procedures.

OBJECTIVES

To determine whether binocular treatments in children aged three to eight years with unilateral amblyopia result in better visual outcomes than conventional occlusion or pharmacological blurring treatment.

SEARCH METHODS

We searched the Cochrane Eyes and Vision Group Trials Register (last date of searches: 14 April 2015), the Cochrane Central Register of Controlled Trials (CENTRAL; 2015, Issue 3), Ovid MEDLINE, Ovid MEDLINE In-Process and Other Non-Indexed Citations, Ovid MEDLINE Daily, Ovid OLDMEDLINE (January 1946 to April 2015), EMBASE (January 1980 to April 2015), the ISRCTN registry (www.isrctn.com/editAdvancedSearch), ClinicalTrials.gov (www.clinicaltrials.gov), and the World Health Organization (WHO) International Clinical Trials Registry Platform (ICTRP) (www.who.int/ictrp/search/en). We did not use any date or language restrictions in the electronic searches for trials.

SELECTION CRITERIA

Two review authors independently screened the results of the search in order to identify studies that met the inclusion criteria of the review: randomised controlled trials (RCTs) that enrolled participants between the ages of three and eight years old with unilateral amblyopia, defined as best-corrected visual acuity (BCVA) worse than 0.200 logMAR in the amblyopic eye, and BCVA 0.200 logMAR or better in the fellow eye, in the presence of an amblyogenic risk factor such as anisometropia, strabismus, or both. Prior to enrolment, participants were to have undergone a cycloplegic refraction and comprehensive ophthalmic examination including fundal examination. In addition, participants had to have completed a period of optical treatment, if indicated, and BCVA in the amblyopic eye had to remain unchanged on two consecutive assessments despite reportedly good compliance with glasses wearing. Participants were not to have received any treatment other than optical treatment prior to enrolment. We planned to include any type of binocular viewing intervention; these could be delivered on different devices including computer monitors viewed with LCD shutter glasses or hand-held screens including mobile phone screens with lenticular prism overlay. Control groups were to have received standard amblyopia treatment; this could include occlusion or pharmacological blurring of the better-seeing eye. We planned to include full-time (all waking hours) and part-time (between 1 and 12 hours a day) occlusion regimens.

DATA COLLECTION AND ANALYSIS

We planned to use standard methodological procedures expected by The Cochrane Collaboration. We had planned to meta-analyse the primary outcome, that is mean distance BCVA in the amblyopic eye at 12 months after the cessation of treatment.

MAIN RESULTS

We could identify no RCTs in this subject area.

AUTHORS' CONCLUSIONS

Further research is required to allow decisions about implementation of binocular treatments for amblyopia in clinical practice. Currently there are no clinical trials offering standardised evidence of the safety and effectiveness of binocular treatments, but results from non-controlled cohort studies are encouraging. Future research should be conducted in the form of RCTs, using acknowledged methods of visual acuity and stereoacuity assessment with known reproducibility. Other important outcome measures include outcomes reported by users, compliance with treatment, and recurrence of amblyopia after cessation of treatment.

Whole-population vision screening in children aged 4-5 years to detect amblyopia

Amblyopia is a neurodevelopmental disorder that affects at least 2% of most populations and can lead to permanently reduced vision if not detected and treated within a specific period in childhood. Whole-population screening of children younger than 5 years is applied in many countries. The substantial diversity in existing programmes reflects their heterogeneous implementation in the absence of the complete evidence base that is now a pre-requisite for instituting screening. The functional importance of amblyopia at an individual level is unclear as data are scarce, but in view of the high prevalence the population-level effect might be notable. Screening of all children aged 4-5 years (eg, at school entry) confers most benefit and addresses inequity in access to timely treatment. Screening at younger ages is associated with increased risk of false-positive results, and at older ages with poor outcomes for children with moderate to severe amblyopia. We suggest that the real-life adverse effects of amblyopia should be characterised and screening and diagnosis should be standardised.

Compliance and patching and atropine amblyopia treatments

In the past 20 years, there has been a great advancement in knowledge pertaining to compliance with amblyopia treatments. The occlusion dose monitor introduced quantitative monitoring methods in patching, which sparked our initial understanding of the dose-response relationship for patching amblyopia treatment. This review focuses on current compliance knowledge and the impact it has on patching and atropine amblyopia treatment.

Developing the draft descriptive system for the child amblyopia treatment questionnaire (CAT-Qol): a mixed methods study

BACKGROUND

Amblyopia is a visual condition that occurs in childhood. Screening programmes exist within the United Kingdom (UK) to detect amblyopia, and once detected treatment is given.Existing patient reported outcome (PRO) measures for amblyopia do not meet current recommendations for the methods adopted during their development, or the way in which the instruments are administered. The overall aim of this study was to produce a self-complete PRO instrument for amblyopia for children aged 4-7 years that uses children's responses in the development phase. The study comprised a number of stages. This paper reports on the refinement of the descriptive system for the draft instrument (the Child Amblyopia Treatment Questionnaire, CAT-QoL) using qualitative and quantitative methods.

METHODS

The study consisted of three components. Children were asked to read, and complete the draft questionnaire as independently as possible. They were then asked about the questionnaire, and its format, in a cognitive debriefing exercise. Observations were made as to the child's ability to read the questionnaire, particular attention was made as to which individual words participants struggled to read. Children were also asked their opinion on the design layout of the questionnaire. Finally, some children were asked to complete a ranking task to help determine the order of the levels of the items as judged by the children. Mid-rank scoring and statistical level of agreement were calculated for the ranking exercise.

RESULTS

Thirty-two (n=32) participants completed a draft questionnaire; each of these underwent a cognitive de-briefing interview. Twenty-two (n=22) children completed the ranking exercise. Ten children did not understand the concept of ranking. The results of the qualitative phase (cognitive de-briefing interview) were used to modify the wording of items and layout of the instrument. Results of the ranking exercise were used to inform the order of the response levels for the items.

CONCLUSION

Responses of young children can be used in the development of PRO instruments. They are able to help inform the content, wording, and format of an instrument, ensuring good content and face validity. The results have been used to further refine the CAT-QoL, however further research is required to assess the psychometric properties of the instrument.