Psychometric properties refer to the validity and reliability of the measurement tool. Before being able to state that a questionnaire has excellent psychometric properties, meaning a scale is both reliable and valid, it must be evaluated extensively. Reliability is the degree to which a measure is free from measurement error and includes internal consistency reliability and test-retest reliability. Validity is the degree to which an instrument measures the outcome concepts it purports to measure and includes content validity, construct validity, criterion validity and responsiveness.

How to cite: Psychometric Properties [online]. (2016). York; York Health Economics Consortium; 2016.


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