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During a CT scan, multiple X-rays are passed through the body, producing cross-sectional images, or ‘‘slices,’’ on a cathode-ray tube, a device resembling a television screen. These images can then be preserved on film for examination.

Conceptual Equivalence Definition The Conceptual Equivalence of a questionnaire indicates that an item measures the same concept in all languages into which this questionnaire has been translated. It differs from linguistic equivalence.

Conceptual Framework Definition An organized set of constructs that provides definitions and categories to structure thinking about social process and behavior change.

Condition-Specific HealthRelated Quality of Life Definition A focused measure that assesses health status associated with a specific acute illness or chronic disease by framing the included functional dimensions or domains of life in a way unique to that disease condition. Such a measure can provide for patient-reported insight into the impact of a specific chronic disease and the benefit versus harm of a specific treatment.

Condition-Specific Instruments Definition Condition-Specific Instruments are designed to be applicable to one group (i.e., individuals with asthma) and are useful to detect changes following an intervention. As they include domains that are specific to an illness, it is more likely that if a change occurs as the result of an intervention, it will be detected.

Conceptual Model Condition-Specific Measures Definition The Conceptual Model consists of an underlying rationale for and the description of the concept that the measure is intended to assess.

Definition Condition‐Specific Measures of QOL include aspects of health that are relevant to particular health problems and may measure several health domains.

Concurrent Validity Synonyms Criterion-Related Validity; External Validity

Condition-Specific Quality of Life Measure

Definition The extent to which two measures correlate, or the extent to which the instrument measures what it intends to measure.

Definition A measure designed to quantify the factors that impact on an individual in a specific disease state.

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