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Table 2 Definitions for aspects of domains and measurement properties from the COSMIN checklist by Mokkink et al. [27]

From: Comparison of psychometric properties between recall methods of interview-based physical activity questionnaires: a systematic review

Psychometric property Domain: Definition
  Validity: The degree to which an HR-PRO instrument measures the construct(s) it purports to measure
Content validity The degree to which the content of an HR-PRO instrument is an adequate reflection of the construct to be measured
 Face validitya The degree to which an HR-PRO instrument indeed looks as though they are an adequate reflection of the construct to be measured
Construct validity The degree to which the scores of an HR-PRO instrument are consistent with hypotheses based on the assumption that a HR-PRO instrument validly measures the construct to be measured
 Structural validityb The degree to which the scores of an HR-PRO instrument are an adequate reflection of the dimensionality of the construct to be measured
Hypothesis testingb Item construct validity
Criterion validity The degree to which the scores of an instrument satisfactorily reflect a “gold standard”
Responsiveness Responsiveness: the capability of an HR-PRO instrument to detect change in the construct to be measured over time
Interpretabilityc Interpretability: the extent to which qualitative meaning is reflective of an instrument’s quantitative scores or score change
Reliability: The degree to which the measurement is free from measurement error
Internal consistency The degree of the interrelatedness among the items
Reliability The proportion of total variance in the measurements due to “true” differences amongst patients
Measurement error The systematic and random error of a patient’s score that is not attributed to true changes in the construct to be measured
  1. Notes: a Aspect of content validity.
  2. b Aspect of construct validity under the domain validity
  3. c Interpretability is no considered a psychometric property