The number of anti-glaucomatous drugs used in the standard-energy group and the sub-threshold energy group before SLT was ( 2.3 0.5 ) and ( 2.1 0.4 ) , respectively ; whereas , after the last treatment , it reduced to ( 1.3 0.5 ) and ( 1.1 0.3 ) , respectively ( Z = -5.477 , -5.396 ; P < 0.05 ) .