The VASOGRADE derived from previously published risk charts and consists of 3 categories : VASOGRADE-Green ( modified Fisher scale 1 or 2 and World Federation of Neurosurgical Societies scale [ WFNS ] 1 or 2 ) ; VASOGRADE-Yellow ( modified Fisher 3 or 4 and WFNS 1-3 ) ; and VASOGRADE-Red ( WFNS 4 or 5 , irrespective of modified Fisher grade ) .