tokens: A lower risk of renal impairment was seen in both groups with beta - blocker therapy ( RR 0 . 70 , 95 % CI 0 . 57 - 0 . 85 ) and higher baseline ejection fraction ( RR 0 . 93 per 5 % increment , 95 % CI 0 . 91 - 0 . 96 ) .