Fewer patients received RBCs on the restrictive policy than on the liberal policy ( restrictive policy 133 [ 33 % ] vs liberal policy 247 [ 46 % ] ; difference -12 % [ 95 % CI -35 to 11 ] ; p = 023 ) , with fewer RBC units transfused ( mean 12 [ SD 21 ] vs 19 [ 28 ] ; difference -07 [ -16 to 03 ] ; p = 012 ) , although these differences were not significant .