At followup ( controls : 137 months ; mannitol : 127 months ) , there were no differences between creatinine or creatinine clearance ( creatinine : controls [ n = 28 ] ; 1.150.39 [ CI95 % 1.02-1 .29 ] v mannitol [ n = 23 ] ; 1.050.27 [ CI95 % : 0.95-1 .17 ] ) .