Another factor, say some doctors, is that many doctors are deliberately pessimistic in cases where there are no objective indicators of the patient's prognosis. In the event that there's a turn for the better, patients are thankful to their doctor for treatment.
也有醫生指出，由於預後情況缺乏客觀的數據，因而醫師往往傾向於將病況說得嚴重些，一旦結果比預期得好，病人對醫師的治療就會心存感謝。