disease onset/diagnosis measurement arthritis onset/diagnosis measurement 2013-01-17T12:44:30Z Any measurement which expresses a quantity related to the beginning, early stages or development of arthritis, or to the official determination of arthritis as the cause of the observed symptom(s). Arthritis is any disease characterized by inflammation of one or more joints, the sites of junction or union between bones, especially those that allow motion of the bones. CMO:0001448 JSmith clinical_measurement_ontology