Psychometric Validation of the ViSIO-PRO and ViSIO-ObsRO in Retinitis Pigmentosa and Leber Congenital Amaurosis

Introduction Retinitis Pigmentosa (RP) and Leber Congenital Amaurosis (LCA) are rare inherited retinal degenerative disorders. The Visual Symptom and Impact Outcomes patient-reported outcome (ViSIO-PRO) and observer-reported outcome (ViSIO-ObsRO) instruments were developed in this population to asse...
Ausführliche Beschreibung

Introduction Retinitis Pigmentosa (RP) and Leber Congenital Amaurosis (LCA) are rare inherited retinal degenerative disorders. The Visual Symptom and Impact Outcomes patient-reported outcome (ViSIO-PRO) and observer-reported outcome (ViSIO-ObsRO) instruments were developed in this population to assess visual function symptoms and impacts on vision-dependent activities of daily living (ADL) and distal health-related quality of life (HRQoL). This study aimed to explore the psychometric properties of the ViSIO-PRO and ViSIO-ObsRO in RP/LCA. Methods The 49-item ViSIO-PRO and 27-item ViSIO-ObsRO instruments were completed by 83 adult and adolescent patients and 22 caregivers of child patients aged 3–11 years with RP/LCA, respectively, at baseline and 12–16-day follow-up. Concurrent measures were also administered at baseline. Psychometric analyses assessed item (question) properties, dimensionality, scoring, reliability, validity, and score interpretation. Results Item responses were mainly evenly distributed across the response scale, and inter-item correlations were mostly moderate to strong (> 0.30) at baseline within hypothesized domains. Item deletion was informed by item properties, qualitative data, and clinical input and supported retention of 35 ViSIO-PRO items and 25 ViSIO-ObsRO items. Confirmatory factor analysis in line with pre-hypothesized domains supported a four-factor model assessing visual function symptoms, mobility, vision-dependent ADL, and distal HRQoL. A bifactor model supported calculation of total scores and four domain scores. Internal consistency was high for domain and total scores (Cronbach’s alpha > 0.70) and test–retest reliability for total scores was strong between baseline and 12–16-day follow-up (intraclass correlation coefficients 0.66–0.98). Convergent validity was supported by strong correlations in a logical pattern with concurrent measures. Mean baseline scores differed significantly between severity groups. Distribution-based methods provided initial insights to guide interpretation of scores. Conclusions Findings supported item reduction and established scoring of the instruments. Evidence of reliability and validity as outcome measures in RP/LCA was also reported. Further research is ongoing to explore responsiveness of the ViSIO-PRO and ViSIO-ObsRO instruments and interpretation of change scores. Ausführliche Beschreibung

Autor*in:	Fischer, M. Dominik [verfasserIn] Patalano, Francesco Naujoks, Christel Banhazi, Judit Bouchet, Christine O’Brien, Paul Kay, Christine Green, Jane Durham, Todd Bradley, Helena Williamson, Nicola Barclay, Melissa Sims, Joel Audo, Isabelle

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2023

Schlagwörter:	Clinical outcome assessment Inherited retinal disease Leber congenital amaurosis Observer-reported outcome Patient-reported outcome Psychometrics Retinitis pigmentosa

Anmerkung:	© The Author(s) 2023

Übergeordnetes Werk:	Enthalten in: Ophthalmology and therapy - Berlin : SpringerOpen, 2012, 12(2023), 2 vom: 27. Feb., Seite 1359-1386
Übergeordnetes Werk:	volume:12 ; year:2023 ; number:2 ; day:27 ; month:02 ; pages:1359-1386

Links:	Volltext

DOI / URN:	10.1007/s40123-023-00670-8

Katalog-ID:	SPR049676679