After adjustment for DCCT baseline factors , intensive therapy was associated with a reduction in the risk of any diabetes-related ocular surgery by 48 % ( 95 % confidence interval [ CI ] , 29 to 63 ; P < 0.001 ) and a reduction in the risk of all such ocular procedures by 37 % ( 95 % CI , 12 to 55 ; P = 0.01 ) .