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Extending basic principles of measurement models to the design and validation of Patient Reported Outcomes.

Atkinson MJ, Lennox RD - Health Qual Life Outcomes (2006)

Bottom Line: In their article, they propose a number of validation and performance criteria with which to evaluate such self-report measures.We provide an alternate, yet complementary, perspective by extending the types of measurement models which are available to the instrument designer.Specification of the measurement model has a major influence on decisions about item and scale design, the appropriate application of statistical validation methods, and the suitability of the resulting measure for a particular use in clinical and population-based outcomes research activities.

View Article: PubMed Central - HTML - PubMed

Affiliation: Worldwide Health Outcomes Research, La Jolla Laboratories, Pfizer Inc., San Diego, CA 92121, USA. mjatkinson@ucsd.edu

ABSTRACT
A recently published article by the Scientific Advisory Committee of the Medical Outcomes Trust presents guidelines for selecting and evaluating health status and health-related quality of life measures used in health outcomes research. In their article, they propose a number of validation and performance criteria with which to evaluate such self-report measures. We provide an alternate, yet complementary, perspective by extending the types of measurement models which are available to the instrument designer. During psychometric development or selection of a Patient Reported Outcome measure it is necessary to determine which, of the five types of measurement models, the measure is based on; 1) a Multiple Effect Indicator model, 2) a Multiple Cause Indicator model, 3) a Single Item Effect Indicator model, 4) a Single Item Cause Indicator model, or 5) a Mixed Multiple Indicator model. Specification of the measurement model has a major influence on decisions about item and scale design, the appropriate application of statistical validation methods, and the suitability of the resulting measure for a particular use in clinical and population-based outcomes research activities.

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A 'Health Status' visual analog scale used in the Health Assessment Questionnaire.
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Figure 4: A 'Health Status' visual analog scale used in the Health Assessment Questionnaire.

Mentions: A general SCI summary rating is sometimes used as a substitute for longer MCI measures. An example is a summary judgment scale used in the Health Assessment Questionnaire, the Health Status Visual Analog Scale (see Figure 4). This single item asks respondents to consider 'all the ways' the disease affects them and the single item presumably reflects the mental combination of a number of different (perceived) arthritic causes of their overall health status. As discussed earlier, details about causes that impact respondents' overall rating are unspecified and allowed to differ across individuals. As a result, such items tend to provide more normally distributed scores than content-specific MCI items which may be relevant to a proportion of respondents.


Extending basic principles of measurement models to the design and validation of Patient Reported Outcomes.

Atkinson MJ, Lennox RD - Health Qual Life Outcomes (2006)

A 'Health Status' visual analog scale used in the Health Assessment Questionnaire.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC1590011&req=5

Figure 4: A 'Health Status' visual analog scale used in the Health Assessment Questionnaire.
Mentions: A general SCI summary rating is sometimes used as a substitute for longer MCI measures. An example is a summary judgment scale used in the Health Assessment Questionnaire, the Health Status Visual Analog Scale (see Figure 4). This single item asks respondents to consider 'all the ways' the disease affects them and the single item presumably reflects the mental combination of a number of different (perceived) arthritic causes of their overall health status. As discussed earlier, details about causes that impact respondents' overall rating are unspecified and allowed to differ across individuals. As a result, such items tend to provide more normally distributed scores than content-specific MCI items which may be relevant to a proportion of respondents.

Bottom Line: In their article, they propose a number of validation and performance criteria with which to evaluate such self-report measures.We provide an alternate, yet complementary, perspective by extending the types of measurement models which are available to the instrument designer.Specification of the measurement model has a major influence on decisions about item and scale design, the appropriate application of statistical validation methods, and the suitability of the resulting measure for a particular use in clinical and population-based outcomes research activities.

View Article: PubMed Central - HTML - PubMed

Affiliation: Worldwide Health Outcomes Research, La Jolla Laboratories, Pfizer Inc., San Diego, CA 92121, USA. mjatkinson@ucsd.edu

ABSTRACT
A recently published article by the Scientific Advisory Committee of the Medical Outcomes Trust presents guidelines for selecting and evaluating health status and health-related quality of life measures used in health outcomes research. In their article, they propose a number of validation and performance criteria with which to evaluate such self-report measures. We provide an alternate, yet complementary, perspective by extending the types of measurement models which are available to the instrument designer. During psychometric development or selection of a Patient Reported Outcome measure it is necessary to determine which, of the five types of measurement models, the measure is based on; 1) a Multiple Effect Indicator model, 2) a Multiple Cause Indicator model, 3) a Single Item Effect Indicator model, 4) a Single Item Cause Indicator model, or 5) a Mixed Multiple Indicator model. Specification of the measurement model has a major influence on decisions about item and scale design, the appropriate application of statistical validation methods, and the suitability of the resulting measure for a particular use in clinical and population-based outcomes research activities.

Show MeSH
Related in: MedlinePlus