tokens: Older age was associated with a greater risk of developing decreased renal function in both groups , but significantly more so in the enalapril group ( enalapril : risk ratio [ RR ] 1 . 42 per 10 years , 95 % confidence interval [ CI ] 1 . 32 - 1 . 52 with enalapril ; placebo : RR 1 . 18 , 95 % CI 1 . 12 - 1 . 25 ) .