Fig. 3

Subgroup analyses stratified by patient and operative variables. The adjusted covariates include age, gender, body mass index, hypertension, preoperative hemoglobin and albumin level, cancer surgery, intraperitoneal surgery, intraoperative blood transfusion, intraoperative hypotension, intraoperative dexmedetomidine, and colloid use. HGBd, hemoglobin drop, the difference between preoperative mean hemoglobin and minimal perioperative hemoglobin, g/L