However , survival to hospital discharge was similar among the intervention and control groups among patients with VF ( 62.7 % [ 95 % CI , 57.0 % -68.0 % ] vs 64.3 % [ 95 % CI , 58.6 % -69.5 % ] , respectively ; P = .69 ) and among patients without VF ( 19.2 % [ 95 % CI , 15.6 % -23.4 % ] vs 16.3 % [ 95 % CI , 12.9 % -20.4 % ] , respectively ; P = .30 ) .