Mortality rate in treatment group was lowered compared with control group , however no statistical significance was found [ 48 hours after treatment : 31.2 % ( 20/64 ) vs. 32.8 % ( 21/64 ) , 2 = 0.084 , P = 0.785 ; 1 week after treatment : 32.8 % ( 21/64 ) vs. 35.9 % ( 23/64 ) , 2 = 2.084 , P = 0.173 ] .