Psychometric evaluation of an item bank for computerized adaptive testing of the EORTC QLQ-C30 cognitive functioning dimension in cancer patients View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2017-07-13

AUTHORS

Linda Dirven, Mogens Groenvold, Martin J. B. Taphoorn, Thierry Conroy, Krzysztof A. Tomaszewski, Teresa Young, Morten Aa. Petersen, on behalf of the EORTC Quality of Life Group

ABSTRACT

BackgroundThe European Organisation of Research and Treatment of Cancer (EORTC) Quality of Life Group is developing computerized adaptive testing (CAT) versions of all EORTC Quality of Life Questionnaire (QLQ-C30) scales with the aim to enhance measurement precision. Here we present the results on the field-testing and psychometric evaluation of the item bank for cognitive functioning (CF).MethodsIn previous phases (I–III), 44 candidate items were developed measuring CF in cancer patients. In phase IV, these items were psychometrically evaluated in a large sample of international cancer patients. This evaluation included an assessment of dimensionality, fit to the item response theory (IRT) model, differential item functioning (DIF), and measurement properties.ResultsA total of 1030 cancer patients completed the 44 candidate items on CF. Of these, 34 items could be included in a unidimensional IRT model, showing an acceptable fit. Although several items showed DIF, these had a negligible impact on CF estimation. Measurement precision of the item bank was much higher than the two original QLQ-C30 CF items alone, across the whole continuum. Moreover, CAT measurement may on average reduce study sample sizes with about 35–40% compared to the original QLQ-C30 CF scale, without loss of power.ConclusionA CF item bank for CAT measurement consisting of 34 items was established, applicable to various cancer patients across countries. This CAT measurement system will facilitate precise and efficient assessment of HRQOL of cancer patients, without loss of comparability of results. More... »

PAGES

2919-2929

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    http://scigraph.springernature.com/pub.10.1007/s11136-017-1648-8

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    http://dx.doi.org/10.1007/s11136-017-1648-8

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    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/28707048


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    32 schema:description BackgroundThe European Organisation of Research and Treatment of Cancer (EORTC) Quality of Life Group is developing computerized adaptive testing (CAT) versions of all EORTC Quality of Life Questionnaire (QLQ-C30) scales with the aim to enhance measurement precision. Here we present the results on the field-testing and psychometric evaluation of the item bank for cognitive functioning (CF).MethodsIn previous phases (I–III), 44 candidate items were developed measuring CF in cancer patients. In phase IV, these items were psychometrically evaluated in a large sample of international cancer patients. This evaluation included an assessment of dimensionality, fit to the item response theory (IRT) model, differential item functioning (DIF), and measurement properties.ResultsA total of 1030 cancer patients completed the 44 candidate items on CF. Of these, 34 items could be included in a unidimensional IRT model, showing an acceptable fit. Although several items showed DIF, these had a negligible impact on CF estimation. Measurement precision of the item bank was much higher than the two original QLQ-C30 CF items alone, across the whole continuum. Moreover, CAT measurement may on average reduce study sample sizes with about 35–40% compared to the original QLQ-C30 CF scale, without loss of power.ConclusionA CF item bank for CAT measurement consisting of 34 items was established, applicable to various cancer patients across countries. This CAT measurement system will facilitate precise and efficient assessment of HRQOL of cancer patients, without loss of comparability of results.
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    39 CF estimation
    40 Cancer Quality
    41 DIF
    42 EORTC Quality
    43 European Organization
    44 HRQoL
    45 IRT models
    46 Life Group
    47 Life Questionnaire
    48 ResultsA total
    49 acceptable fit
    50 adaptive testing
    51 aim
    52 assessment
    53 assessment of dimensionality
    54 banks
    55 cancer patients
    56 candidate items
    57 cognitive functioning
    58 comparability
    59 computerized adaptive testing
    60 computerized adaptive testing (CAT) version
    61 continuum
    62 countries
    63 differential item
    64 dimensionality
    65 dimensions
    66 efficient assessment
    67 estimation
    68 evaluation
    69 fit
    70 functioning
    71 group
    72 impact
    73 item bank
    74 item response theory models
    75 items
    76 large sample
    77 loss
    78 loss of comparability
    79 loss of power
    80 measurement precision
    81 measurement properties
    82 measurement system
    83 measurements
    84 model
    85 negligible impact
    86 organization
    87 patients
    88 phase
    89 phase IV
    90 power
    91 precision
    92 previous phase
    93 properties
    94 psychometric evaluation
    95 quality
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    97 research
    98 results
    99 sample size
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    101 scale
    102 size
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