Objective: To assess factors associated with outcomes of threatened abortion.Methods: A total of 338 women,who were hospitalized during January 2006 to December 2009 for threatened abortion in the first trimester,were divided into two groups,the success group were successfully treated(239 cases) while pregnancies of the failure group failed to continue(99 cases).Results: Compared with the control group,older median ages,more times of previous intrauterus manipulations as well as higher rates of applications...