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Measuring the quality of life of visually impaired children: First stage psychometric evaluation of the Novel VQoL_CYP Instrument

Measuring the quality of life of visually impaired children: First stage psychometric evaluation of the Novel VQoL_CYP Instrument

Tadic, Valerija ORCID: 0000-0003-3982-0340, Cooper, Andrew, Cumberland, Phillippa, Lewando-Hundt, Gillian and Rahi, Jugnoo S. (2016) Measuring the quality of life of visually impaired children: First stage psychometric evaluation of the Novel VQoL_CYP Instrument. PLOS ONE, 11 (2). e0146225. ISSN 1932-6203 (Online) (doi:https://doi.org/10.1371/journal.pone.0146225)

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Abstract

Purpose:
To report piloting and initial validation of the VQoL_CYP, a novel age-appropriate vision-related quality of life (VQoL) instrument for self-reporting by children with visual impairment (VI).

Methods:
Participants were a random patient sample of children with VI aged 10–15 years. 69 patients, drawn from patient databases at Great Ormond Street Hospital and Moorfields Eye Hospital, United Kingdom, participated in piloting of the draft 47-item VQoL instrument, which enabled preliminary item reduction. Subsequent administration of the instrument, alongside functional vision (FV) and generic health-related quality of life (HRQoL) self-report measures, to 101 children with VI comprising a nationally representative sample enabled further item reduction and evaluation of psychometric properties using Rasch analysis. Construct validity was assessed through Pearson correlation coefficients.

Results:
Item reduction through piloting (8 items removed for skewness and individual item response pattern) and validation (1 item removed for skewness and 3 for misfit in Rasch) produced a 35-item scale, with fit values within acceptable limits, no notable differential item functioning, good measurement precision, ordered response categories and acceptable targeting in Rasch. The VQoL_CYP showed good construct validity, correlating strongly with HRQoL scores, moderately with FV scores but not with acuity.

Conclusions:
Robust child-appropriate self-report VQoL measures for children with VI are necessary for understanding the broader impacts of living with a visual disability, distinguishing these from limited functioning per se. Future planned use in larger patient samples will allow further psychometric development of the VQoL_CYP as an adjunct to objective outcomes assessment.

Item Type: Article
Additional Information: Copyright: © 2016 Tadić et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Uncontrolled Keywords: visual impairment, vision related quality of life, questionnaire, children and young people
Faculty / Department / Research Group: Faculty of Education & Health
Faculty of Education & Health > Applied Psychology Research Group
Faculty of Education & Health > Department of Psychology, Social Work & Counselling
Last Modified: 30 May 2019 11:45
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: GREAT 1
URI: http://gala.gre.ac.uk/id/eprint/24212

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