Exploring the Content Validity of the Unified Wilson Disease Rating Scale: Insights from Qualitative Research.

INTRODUCTION: Wilson disease (WD) is a rare metabolic disorder of impaired copper transport manifesting in hepatic, neurological, and psychiatric symptoms. To evaluate the clinical symptoms of WD in clinical trials, a group of clinicians created the Unified Wilson Disease Rating Scale (UWDRS). Content validity of this scale has not been established. The aim of this study was to evaluate the content validity of the UWDRS Part II from the patient perspective. METHODS: This study utilized multiple qualitative research methods including concept elicitation interviews, concept/instrument mapping, and cognitive debriefing interviews. RESULTS: Concept elicitation interviews with a sample of patients with WD and one or more neurological signs/symptoms identified several signs, symptoms, and impacts related to neurological dysfunction, strengthening our understanding of the importance of the neurological aspects of the WD patient experience. Mapping neurological concepts to Part II and III items of the UWDRS showed complete coverage of all salient neurological concepts and near complete coverage of all neurological concepts reported by patients in concept elicitation interviews. Item debriefing of Part II of the UWDRS revealed that patients generally found the items clear and personally relevant to their experience with WD. CONCLUSION: Overall, the findings from this study provide evidence for the content validity of the UWDRS Part II and supportive evidence for the content validity of Part III. The UWDRS should be used in conjunction with additional clinical outcomes assessments, specifically those evaluating the hepatic and psychiatric signs/symptoms of WD, to provide a comprehensive evaluation of the WD patient experience.

Development of an Item Bank to Assess Patient-Reported Outcomes: Signs, Symptoms, and Impacts of COVID-19.

BACKGROUND AND OBJECTIVE: Patients experience a wide range of signs, symptoms, and impacts related to coronavirus disease 2019 (COVID-19). A patient-reported outcome (PRO) item bank that measures the most relevant patient experiences is needed to fully evaluate treatment benefit in COVID-19 clinical trials. METHODS: A review of the literature and social media informed a novel PRO item bank of COVID-19 signs, symptoms, and impacts and general pandemic impacts. Twenty 1:1 concept elicitation and cognitive debriefing interviews were conducted with adults in the US who had symptomatic COVID-19. A conceptual model was developed and the PRO item bank refined following interviews. RESULTS: A heterogenous set of signs, symptoms, and impacts of COVID-19, as well as impacts associated with the pandemic overall, was identified. Fifty-five short-term and long-term signs and symptom items, 26 items assessing disease-related impacts, and seven items evaluating pandemic-related impacts are included in the item bank. CONCLUSIONS: The novel and preliminarily content-valid IQVIA COVID-19 Daily Diary Item Bank© and the IQVIA COVID-19 Weekly Diary Item Bank© were developed to measure signs and symptoms, their associated severity, and disease-related and pandemic-related impacts. The items are arranged in seven groups and can be individually selected based on research needs.

The patient experience of Wilson disease: a conceptual model based on qualitative research.

BACKGROUND: Wilson disease (WD) is a rare disease wherein copper accumulates in tissues, leading to hepatic degeneration, neurological impairments, and psychiatric symptoms. This study aimed to characterize the patient experience of WD and develop a conceptual model containing key symptoms and impacts of the disease. RESULTS: A targeted literature review was conducted to develop a preliminary conceptual model of WD that was subsequently refined through one-on-one interviews with 3 WD clinicians and finalized following concept elicitation interviews with 11 patients and 1 caregiver. The literature review returned 30 articles, from which 45 concepts (35 signs/symptoms and 10 impacts) were selected for inclusion in the preliminary conceptual model. After interviews with clinicians, the model was expanded to include 45 signs/symptoms and 14 impacts. The final comprehensive conceptual model developed after interviews with patients included 54 symptoms in total (n = 22 hepatic, n = 19 neurological, n = 13 psychiatric), and 21 impacts. Across symptoms, patients reported a high level of bother, with approximately 49% of symptoms reported by patients having an average peak bother rating of ≥ 7 out of 10 (10 = most bothersome). Patient interviews identified 2 subgroups of patients: those who experience neurological, psychiatric, and hepatic symptoms and those who experience mostly hepatic and some psychiatric symptoms, but no neurological symptoms. CONCLUSIONS: This research underscores the substantial multisystemic symptoms and impacts that patients with WD describe as highly bothersome in their lives. Hepatic symptoms emerged as especially common and important to patients with WD, possibly beyond what is commonly understood in research and clinical practice. Further, the description of 2 distinct patient groups may help to inform patient management and support more targeted drug development processes.