Univariate analysis observed the following indicators with clinically significant: preoperative GCS score, bilateral pupils abnormality size and reactivity, status of basal cisterns, intraoperative blood loss, postoperative GCS score at the first day, postoperative delayed contusion and hematoma, postoperative delayed contralateral hematoma, tracheostomy, hospital acquired pneumonia, PTH, postoperative hypernatremia and hyperglycaemia. The gene discussed is PTH; the disease is Hypernatremia.