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    The Contact Lens Impact on Quality of Life (CLIQ) questionnaire: development and validation

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    Publication date
    2009-06-02T09:24:30Z
    Author
    Pesudovs, Konrad
    Garamendi, Estibaliz
    Elliott, David B.
    Keyword
    Contact lens
    Quality of life
    Validation
    Ophthalmology
    Development
    Questionnaire
    Human
    Instrumentation therapy
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    PURPOSE. To develop and validate a questionnaire for the measurement of the impact of contact lenses on quality of life (QoL): The Contact Lens Impact on Quality of Life (CLIQ) Questionnaire. METHODS. The questionnaire was developed and validated using conventional methods and Rasch analysis to assure content validity, repeatability, construct validity, and low respondent burden. Item identification and selection (647 items) were performed with an extensive literature review, professional advice, and lay focus groups. Item reduction used focus groups and data obtained from 161 subjects completing a 90-item pilot questionnaire. Validity and reliability, from data of 128 additional subjects, were assessed using Rasch analysis, intraclass correlation coefficient, and Bland-Altman limits of agreement. RESULTS. A 28-item CLIQ Questionnaire was developed and shown to have good validity and reliability by Rasch analysis statistics: real person separation, 2.02; model person separation, 2.17; reliability, 0.80; root mean square measurement error, 2.73; mean square ± SD infit, 1.01 ± 0.18; outfit, 1.01 ± 0.19. The items (mean score, 49.8 ± 4.9) were well targeted to the subjects (mean score, 51.2 ± 6.2) with a mean difference of 1.35 (scale range, 0-100) units. Test-retest intraclass correlation coefficient (0.86) and coefficient of repeatability (±8.00 units) demonstrated good repeatability. CONCLUSIONS. Rasch analysis and standard psychometric analyses demonstrated that the 28-item CLIQ Questionnaire is a valid and reliable measure of QoL in contact lens wearers. A scoring algorithm is provided for CLIQ Questionnaire users to convert raw scores into the Rasch analysis-derived linear person measures.
    URI
    http://hdl.handle.net/10454/2733
    Version
    No full-text available in the repository
    Citation
    Pesudovs K, Garamendi E and Elliott DB (2006) The Contact Lens Impact on Quality of Life (CLIQ) questionnaire: development and validation. Investigative Ophthalmology and Visual Science. 47(7): 2789-2796.
    Link to publisher’s version
    http://www.iovs.org/cgi/reprint/47/7/2789.pdf
    Type
    Article
    Collections
    Life Sciences Publications

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