Several factors were identified to be irrelevant for postoperative anemia, such as age, smoking, drinking, drug taking, high CRP levels, comorbidities, etc. In previous researches, predictors like age, comorbidities, etc showed significant results and were included in the predictive models in previous researches (10, 11, 32); unfortunately, such relevance was not identified in this study, along with other factors such as high CRP levels, smoking, drug taking. Here, CRP is linked to anemia (phenotype).