Thirty-day mortality , 5 ( 6.0 % ) vs 4 ( 5.2 % ) patients ( P = 1.00 ) , incidence of serious AEs , 24 ( 28.9 % ) vs 20 ( 26.0 % ) ( P = 0.73 ) , or time to intensive care unit ( log-rank P = 0.15 ) or hospital discharge ( log-rank P = 0.53 ) were similar for the HBOC-201 and RBC groups , respectively .