As compared with placebo , four-channel group had statistically significant difference [ ( 52 12 ) vs ( 38 18 ) , P < 0.05 ] ; At week 2 post-treatment , the scores of PASS and MBI were ( 29 3 , 73 13 ) in four-channel FES group versus ( 24 8 , 60 17 ) in dual-channel FES group .