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Table 2 Definitions for aspects of domains and measurement properties from the COSMIN checklist by Mokkink et al. (2010)

From: Comparison of psychometric properties between usual-week and past-week self-reported physical activity questionnaires: a systematic review

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 the total variance in the measurements which is because of “true” differences among 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

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 validity

  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 measure validly measures the construct to be measured

  Structural validity

  The degree to which the scores of an HR-PRO measure are an adequate reflection of the dimensionality of the construct to be measured

  Hypotheses testing

  Item construct validity

  Cross-cultural validity

  The extent to which performance of the items from translated or culturally adapted measures adequately replicates the performance of the items from original versions of the measure

 Criterion validity

 The degree to which the scores of a measure adequately reflect a “gold standard”

 Responsiveness

 The measure’s sensitivity to changes in the construct to be measured over time

 Interpretability a

 The extent to which qualitative meaning can be derived from a measure’s quantitative scores or score change

  1. aInterpretability is not considered a psychometric property