The 6-month Karnofsky Performance Scale score of study cases was significantly higher than that of control cases ( 86 + / - 20 versus 74 + / - 28 overall , P < 0.001 ; 93 + / - 10 versus 86 + / - 17 for low-grade gliomas , P = 0.013 ; and 77 + / - 27 versus 53 + / - 32 for HGGs , P = 0.001 ) .
