Abstract
concludedthat blood loss of more than 250 mL dur-ing surgery was an independent risk factor of5-year mortality after colon cancer surgery.In the Cox proportional hazard model, theprimary outcome was all-cause mortality andtheexplanatoryvariableswereage,sex,bloodloss, stage of the disease, and postoperativecomplications (model 1) or blood transfusion(model 2). In model 2, blood transfusion wasnot an independent risk factor of 5-year mor-tality, whereas in model 1, age of 75 yearsor more was the strongest predictor for death.In dichotomizing the continuous data, a vol-ume of 250 mL was chosen as a cutoff forblood loss because this was the median valuefor the whole group, whereas the reason for
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