![]() ![]() The method of measurement must also be sufficiently sensitive for a specific purpose. Measurements are reliable if they are reproducible and stable over time and if they display adequate absence of measurement errors. To be clinically and scientifically useful, any method of measurement should be valid, reliable, and sufficiently sensitive. ![]() In medical research and clinical practice, measurements are regularly obtained for different purposes, for example, to detect and diagnose a disease, to plan an appropriate intervention for a patient, to assess the short-term effects of an intervention on a patient, and to assess the long-term effects on a group of patients. It also explains the way reliability studies can aid scientists and clinicians in the interpretation of results from interventions, both at the group level and for individual patients. The analyses are illustrated using measurements of muscle performance. It discusses some related issues such as the sample size, power, and the concept of responsiveness. This chapter reviews the methods of assessing reliability for continuous data in medical research. ![]()
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