You are designing a study to look at the effect of tranexamic acid administration on intra-operative hemorrhage in high-risk scoliosis patients undergoing posterior spinal fusion. You plan to randomize half of the patients to receive tranexamic acid and the other half to receive a placebo. You then plan to compare the estimated blood loss at the end of each case. Which of the statistical tests must be used to compare the study results?
Question of the Week #44