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Table 1 COSMIN taxonomy of measurement properties [29]

From: Measurement properties of smartphone approaches to assess key lifestyle behaviours: protocol of a systematic review

DomainMeasurement propertiesDefinition
Reliability (The degree to which the measurement is free from measurement error)Internal consistencyThe degree of the interrelatedness among the items
ReliabilityThe proportion of the total variance in the measurements which is due to ‘true’ differences between patients
Measurement errorThe 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 instrument measures the construct(s) it purports to measure)Content validity (including face validity)The degree to which the content of an instrument is an adequate reflection of the construct to be measured
Construct validity (including structural validity, hypothesis testing, cross-cultural validity)The degree to which the scores of an instrument are consistent with hypotheses (for instance, with regard to internal relationships, relationships to scores of other instruments or differences between relevant groups) based on the assumption that the instrument validly measures the construct to be measured
Criterion validityThe degree to which the scores of an instrument are an adequate reflection of a ‘gold standard’
ResponsivenessResponsivenessThe ability of an instrument to detect change over time in the construct to be measured
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