The Clinical Measurement Ontology (CMO), Measurement Methods Ontology (MMO), and Experimental Condition Ontology (XCO) are currently being developed at the Rat Genome Database. For more information about these vocabularies please see Shimoyama et al. Three ontologies to define phenotype measurement data. Front Genet. 2012;3:87. Epub 2012 May 28 or contact us (http://rgd.mcw.edu/contact/index.shtml).
A measurement in which the number of individuals in a study population that display one or more non-tumorous cerebrovascular lesion(s) at a point in time or develop such lesions within a determined period of time are compared to the total number of individuals in the study population. Often expressed as a percentage but could be expressed as a ratio. A non-tumorous cerebrovascular lesion is a non-neoplastic, localized, pathological change in the structure of the brain which involves or is caused by a component of the vascular system and/or blood supply of the brain, due to injury or disease; especially one that is circumscribed and well defined.