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Objectives:The purpose of this study was to investigate sociodemographic factors for suicidal attempts in major depressive disorder patients. Methods:We compared the sociodemographic characteristics and clinical history of major depressive disorder (MDD) inpatients who were with suicidal attempts and without suicidal attempts. 314 suicidal attempters who were diagnosed as major depressive disorder by SCID-I interview participated in this study. Besides, 237 patients with major depressive disorder who did not attempt suicide. Results:The MDD patients with suicidal attempts showed younger age, higher education, earlier onset, less frequency of episodes, and shorter duration of illness than patients without suicide attempts. Besides, depressed suicidal attempters showed high proportion of unmarried person than non-suicidal attempters. Conclusion:The most serious outcome of major depression, suicidal attempts is results from the interaction of various factors. This study provides an evidence for distinct sociodemographic and historical factors for suicide attempts in the MDD group.