Changes to the subscales of two vision-related quality of life questionnaires are proposed

M.R. de Boer, H.C.W. de Vet, C.B. Terwee, A.C. Moll, H.J.M. Volker-Dieben, G.H.M.B. van Rens

    Research output: Contribution to JournalArticleAcademicpeer-review

    Abstract

    Background and Objective: Psychometrically sound questionnaires for the assessment of vision-related quality of life (QOL) are scarce. Therefore, the objective was to further validate two vision-related QOL questionnaires in a Dutch population of visually impaired elderly. Methods: A total of 329 visually impaired older persons referred to low vision services completed the low vision QOL (LVQOL) and Vision-Related Quality of Life Core Measure (VCM1) questionnaires at baseline, after 1-4 weeks (retest), and after 5 months. Confirmatory factor analyses were performed on baseline data. The smallest detectable change (SDC) was assessed, based on the standard error of measurement (SEM). Change scores between the baseline and 5 months follow-up data were related to a general transition question to assess the minimal important change (MIC). Furthermore, the MIC was related to the SDC, to examine whether the MICs were detectable beyond measurement error. Results: The original factor structures could not be confirmed. After omitting items and remodeling, adequate fits were obtained. SDCs comprised at least one quarter of the scale for all scales and subscales on the individual level and exceeded the MICs on every occasion. Conclusion: We propose MICs of 5-10 points for the scales and subscales of the LVQOL and VCM1. The questionnaires are not useful in the follow-up of individual patients. © 2005 Elsevier Inc. All rights reserved.
    Original languageEnglish
    Pages (from-to)1260-1268
    JournalJournal of Clinical Epidemiology
    Volume58
    Issue number12
    DOIs
    Publication statusPublished - 2005

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    Low Vision
    Quality of Life
    Visually Impaired Persons
    Statistical Factor Analysis
    Surveys and Questionnaires
    Population

    Cite this

    de Boer, M. R., de Vet, H. C. W., Terwee, C. B., Moll, A. C., Volker-Dieben, H. J. M., & van Rens, G. H. M. B. (2005). Changes to the subscales of two vision-related quality of life questionnaires are proposed. Journal of Clinical Epidemiology, 58(12), 1260-1268. https://doi.org/10.1016/j.jclinepi.2005.04.007
    de Boer, M.R. ; de Vet, H.C.W. ; Terwee, C.B. ; Moll, A.C. ; Volker-Dieben, H.J.M. ; van Rens, G.H.M.B. / Changes to the subscales of two vision-related quality of life questionnaires are proposed. In: Journal of Clinical Epidemiology. 2005 ; Vol. 58, No. 12. pp. 1260-1268.
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    abstract = "Background and Objective: Psychometrically sound questionnaires for the assessment of vision-related quality of life (QOL) are scarce. Therefore, the objective was to further validate two vision-related QOL questionnaires in a Dutch population of visually impaired elderly. Methods: A total of 329 visually impaired older persons referred to low vision services completed the low vision QOL (LVQOL) and Vision-Related Quality of Life Core Measure (VCM1) questionnaires at baseline, after 1-4 weeks (retest), and after 5 months. Confirmatory factor analyses were performed on baseline data. The smallest detectable change (SDC) was assessed, based on the standard error of measurement (SEM). Change scores between the baseline and 5 months follow-up data were related to a general transition question to assess the minimal important change (MIC). Furthermore, the MIC was related to the SDC, to examine whether the MICs were detectable beyond measurement error. Results: The original factor structures could not be confirmed. After omitting items and remodeling, adequate fits were obtained. SDCs comprised at least one quarter of the scale for all scales and subscales on the individual level and exceeded the MICs on every occasion. Conclusion: We propose MICs of 5-10 points for the scales and subscales of the LVQOL and VCM1. The questionnaires are not useful in the follow-up of individual patients. {\circledC} 2005 Elsevier Inc. All rights reserved.",
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    Changes to the subscales of two vision-related quality of life questionnaires are proposed. / de Boer, M.R.; de Vet, H.C.W.; Terwee, C.B.; Moll, A.C.; Volker-Dieben, H.J.M.; van Rens, G.H.M.B.

    In: Journal of Clinical Epidemiology, Vol. 58, No. 12, 2005, p. 1260-1268.

    Research output: Contribution to JournalArticleAcademicpeer-review

    TY - JOUR

    T1 - Changes to the subscales of two vision-related quality of life questionnaires are proposed

    AU - de Boer, M.R.

    AU - de Vet, H.C.W.

    AU - Terwee, C.B.

    AU - Moll, A.C.

    AU - Volker-Dieben, H.J.M.

    AU - van Rens, G.H.M.B.

    PY - 2005

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    N2 - Background and Objective: Psychometrically sound questionnaires for the assessment of vision-related quality of life (QOL) are scarce. Therefore, the objective was to further validate two vision-related QOL questionnaires in a Dutch population of visually impaired elderly. Methods: A total of 329 visually impaired older persons referred to low vision services completed the low vision QOL (LVQOL) and Vision-Related Quality of Life Core Measure (VCM1) questionnaires at baseline, after 1-4 weeks (retest), and after 5 months. Confirmatory factor analyses were performed on baseline data. The smallest detectable change (SDC) was assessed, based on the standard error of measurement (SEM). Change scores between the baseline and 5 months follow-up data were related to a general transition question to assess the minimal important change (MIC). Furthermore, the MIC was related to the SDC, to examine whether the MICs were detectable beyond measurement error. Results: The original factor structures could not be confirmed. After omitting items and remodeling, adequate fits were obtained. SDCs comprised at least one quarter of the scale for all scales and subscales on the individual level and exceeded the MICs on every occasion. Conclusion: We propose MICs of 5-10 points for the scales and subscales of the LVQOL and VCM1. The questionnaires are not useful in the follow-up of individual patients. © 2005 Elsevier Inc. All rights reserved.

    AB - Background and Objective: Psychometrically sound questionnaires for the assessment of vision-related quality of life (QOL) are scarce. Therefore, the objective was to further validate two vision-related QOL questionnaires in a Dutch population of visually impaired elderly. Methods: A total of 329 visually impaired older persons referred to low vision services completed the low vision QOL (LVQOL) and Vision-Related Quality of Life Core Measure (VCM1) questionnaires at baseline, after 1-4 weeks (retest), and after 5 months. Confirmatory factor analyses were performed on baseline data. The smallest detectable change (SDC) was assessed, based on the standard error of measurement (SEM). Change scores between the baseline and 5 months follow-up data were related to a general transition question to assess the minimal important change (MIC). Furthermore, the MIC was related to the SDC, to examine whether the MICs were detectable beyond measurement error. Results: The original factor structures could not be confirmed. After omitting items and remodeling, adequate fits were obtained. SDCs comprised at least one quarter of the scale for all scales and subscales on the individual level and exceeded the MICs on every occasion. Conclusion: We propose MICs of 5-10 points for the scales and subscales of the LVQOL and VCM1. The questionnaires are not useful in the follow-up of individual patients. © 2005 Elsevier Inc. All rights reserved.

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    DO - 10.1016/j.jclinepi.2005.04.007

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