The fluorescein angiography-based improvement rate in the 30 % - dose PDT group was less than that in the 50 % - dose PDT group both at 6 months ( 68.9 % vs 91.1 % ; = 0.0125 , P = .003 ) and at 12 months ( 68.9 % vs 92.9 % ; = 0.0125 , P = .001 ) .