No significant differences were detected in mortality at @ hours ( @ % in @:@:@ group vs @ % in @:@:@ group ; difference , -@ % -LSB- @ % CI , -@ % to @ % -RSB- ; P = @ ) or at @ days ( @ % vs @ % , respectively ; difference , -@ % -LSB- @ % CI , -@ % to @ % -RSB- ; P = @ ) .