Background: Suicide is a serious public health issue.Approximately 800000 people commit suicide every year.Suicide attempt has been shown to be a strong risk factor of suicide.It was reported that suicide risk after suicide attempt was highest during the first 3 years, especially in the first 6 months.A systematic review of studies reported that the risk of suicide within a year after self-harm was 0.5% to 2%.Many risk factors of suicide after suicide attempt were reported including male, advanced age, psychiatric disorder/history, repeated attempts, long-term use of hypnotics, and poor physical health.However, as far as we know, there was no study which investigated the association between method of suicide attempt and subsequent suicide.Also, few studies investigated the association between psychological feature at the time of self-poisoning and subsequent suicide.Little is known about risk factor of suicide within a short period after suicide attempt.The purpose of this study was to investigate the risk factors including social background and psychological features at the time of self-poisoning for suicide within a year after admission for self-poisoning.Methods: This study was a fixed-length cohort study which followed up self-poisoning patients who admitted to the emergency department of a public hospital in Tokyo between March 2008 and February 2009 for a period of one-year.Only those who gave informed consent to participate were included.Exclusion criteria were those who could not have enough Japanese skills to complete the questionnaire and interview.Eligible patients were administered self-questionnaires and interviewed by psychiatrists in the hospital after they recovered from coma and became clearly conscious.The self-questionnaire included K10 (The Kessler Psychological Distress Scale) and ADES (Adolescent Dissociation Experience Scale).The interviewer examined socio-demographic background, type and amount of pills taken for overdose, and past psychiatric history.The severity of suicide intent was evaluated using shortened version of Intent Scale extracted from Beck Scale of suicidal intent.Those who did not have ongoing psychiatric medicine were introduced a psychiatrist near the patients home address when discharging.One year after the admission due to self-poisoning, a letter was sent to psychiatrist in charge to ask for information about suicide-related events within one-year period.Socio-demographic background, type of pills taken for overdose, past psychiatric history of the patients, severity of depression and dissociation, and suicide intent were regarded as exposures of interest.Outcome measurement of interest was suicidal event within one-year period of follow-up.Logistic regression was performed to investigate odds of suicide completion for each exposure variable.As the sample size was not large, only invariable analysis was performed.Results: A total of 181 admissions of 177 patients to the emergency department in a public hospital in Tokyo due to self-poisoning were observed in the study period.Of the 177 patients, a total of 132 patients completed self-questionnaire.Of the 132 patients, 71 patients were followed-up for one year, with the follow-up rate of 53.8%.The result of the analysis will be shown and discussion will be followed.