Clinical variables that were assessed as predictors of core body temperature included age, sex, body mass index (BMI), time of procedure, anesthesia technique, estimated blood loss, amount and temperature of intravenous fluids, operation room temperature,... and potential hypothermia related complications were also examined Results: Frequency of hypothermia (< 36oC) in major abdominal surgeries was 87.13%, mild-hypothermia was common (84.16%).