Intragroup comparisons showed that CERO ( 2 ) increased by 14.3 % ( P = 0.009 , LR group ) and 13.2 % ( P = 0.032 , HES group ) , respectively , and SjvO ( 2 ) was decreased by 8.8 % ( P = 0.016 , LR group ) and 8.1 % ( P = 0.026 , HES group ) , respectively , after tumor removal , compared with baseline .