preop-Hb group transfusion 12.9 0 No 13.5 0 No 14.0 0 No 13.0 0 No 13.5 0 No 13.9 0 No 12.5 0 No 12.7 0 No 13.6 0 No 13.7 0 No 13.8 0 No 13.8 0 No 13.4 0 No 15.7 0 No 13.0 0 No 12.0 0 No 11.8 0 No 12.6 0 No 13.5 0 No 13.2 0 No 12.2 0 No 12.7 0 No 12.8 0 No 14.2 0 No 15.0 0 No 11.5 0 No 12.2 0 No 11.3 0 No 11.5 0 No 14.0 0 No 11.3 1 Yes 11.0 1 Yes 12.4 1 Yes 12.1 1 Yes 12.6 1 Yes 14.4 1 Yes 12.4 1 Yes 14.4 1 Yes 15.4 1 Yes 13.8 1 Yes 10.8 1 Yes 11.3 1 Yes 11.0 1 Yes 13.2 1 Yes 11.0 1 Yes 12.7 1 Yes 11.8 1 Yes 11.6 1 Yes 9.7 1 Yes 12.1 1 Yes 11.3 1 Yes 12.9 1 Yes 13.2 1 Yes 11.0 1 Yes 14.0 1 Yes 10.6 1 Yes 12.0 1 Yes 12.5 1 Yes 11.7 1 Yes 12.8 1 Yes