ratio DisGeNET Pleiotropy Index SIO_001352 The DisGeNET pleiotropy index is a measure of specificity as it pertains to classes of disease. The disease pleotropy index is computed from the ratio of the number of disease classes associated with an entity over the total number of disease classes multplied by 100. The measure is defined here: http://www.disgenet.org/web/DisGeNET/menu/dbinfo#pleiotropy