There was no significant difference in age, sex, history of diabetes mellitus, history of hypertension, history of smoking, history of alcohol consumption, volume of hematoma on admission, duration of drain retention, intracranial pressure before hematoma removal, intracranial pressure after hematoma removal, admission glucose, serum calcium, serum sodium, cystatin, or hyperhomocysteinemia between the poor and good outcome groups. This evidence concerns the gene CST4 and diabetes mellitus.