At T1 both groups displayed a reduction of GIS score ( `` true '' group 3.3 1.7 , -50 % , P = 0.001 ; control group 4.9 2.8 , -26.9 % , P = 0.02 ) , although the GIS score was significantly lower in `` true '' vs `` control '' group ( P = 0.04 ) .