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Introduction In South Korea, all men at the age of 18 or older are required to serve at military for a certain period as an obligation. These recruits should be able to withstand psychological stress and pressures of rapid adaptation of the unique and new environment in military. The number of military recruits facing adaptation issues has been on the rise, necessitating an evaluation for active service. In our previous study (Park et al., in press 2023), we classified the military recruits with mental issues according to latent profile analysis (LPA) and examined the treatment response during six months. Objectives In this study, we further examined clinical characteristics over the next six months. Methods Ninety-two participants were analyzed with LPA using MMPI-2 clinical profiles in the previous study. The three classes were identified: mild maladjustment (Class 1, n=14), neurotic depression and anxiety (Class 2, n=36), high vulnerability and hypervigilance (Class 3, n=42). At 12 months, Clinical Global Impression-Severity and Global Assessment of Functioning were assessed to test their long-term changes. Results While Class 1 and 2 significantly improved over 6 months, Class 3 showed little or no improvement even with more medications in our previous study. During the 6-month follow-up period, 50% of Class 1, 38.9% of Class 2, and 41.5% of Class 3 were dropped. It was during this period that their level of military service was decided. Class 1 and 2 which showed marked improvement up to initial 6 months, did not demonstrate substantial further improvement during follow-up period with a considerable portion stopped visiting hospital. Subjects in Class 3, who showed little or no improvement during initial 6 months, demonstrated continued improvement in this study, although their symptoms still appeared relatively severe. Conclusions This study suggests clinical implications for treatment plan and intervention of each subgroup classified based on MMPI-2 clinical profiles of military recruits who might show maladjustment to serve. The long-term continuous treatment for Class 3 patients will be needed, even after exemption from active duty. Disclosure of Interest None Declared

Introduction In South Korea, all men at the age of 18 or older are required to serve at military for a certain period as an obligation. These recruits should be able to withstand psychological stress and pressures of rapid adaptation of the unique and new environment in military. Objectives The current study attempted to identify distinct subgroups of patients referred for military service suitability and further to investigate whether there is a difference in clinical features such as treatment responsiveness and prognosis among those subgroups. Methods Subjects were male patients aged 18 to 28 years who visited the department of psychiatry at the University Hospital for evaluating mental health problems related to military service. We conducted a latent profile analysis (LPA) using 10 clinical scales of MMPI-2 as an indicator variable to investigate the subgroups of subjects. The clinical state of subjects was assessed with CGI-S and GAF scale for three time point (0, 3, and 6 month). Results The results showed that the best fitting model corresponded to a three-class model: each class was named ‘Class 1: mild maladjustment’, ‘Class 2: neurotic depression and anxiety’, and ‘Class 3: highly vulnerable and hypervigilant’ respectively. Subsequent analysis was also carried out to identify changes in clinical symptoms and functional level across treatment time of each subgroup identified in LPA. We demonstrated that the three subgroups displayed differential characteristics in treatment responsiveness and clinical course evaluated by CGI-S and GAF over a treatment period of 6 months. Three subgroups indicated significant differences in the number of medications prescribed as well. Class 3 had more antidepressants and anxiolytics on use than Class 1 and 2. Antipsychotic agents and a combination of three antidepressants were prescribed more frequently in Class 3 than in Class 1 and 2. Conclusions While Class 1 and 2 significantly improved over 6 months, Class 3 showed little or no improvement in our clinical parameters even with more medications. This study has a clinical significance that it has classified qualitatively different subgroups within the sample by conducting LPA with clinical profiles of MMPI-2 and provides a basis for comprehensively understanding their differentiated clinical features. This study suggests clinical implications for treatment plan and intervention of each subgroup classified based on MMPI-2 clinical profiles of military recruits who might show maladjustment to serve. Disclosure of Interest None Declared

Introduction Suicide is a complex problem in which individual, family social factors are interrelated. The 1997 Asian financial crisis caused a major economic crisis in Korea, and Korea received bailout support from the International Monetary Funds(IMF) from December 23, 1997 to August 23, 1997. Objectives This study aimed to investigate the relationship between the suicide rate of children and adolescents who grew up during this economic crisis in Korea. Methods Suicide rates are calculated according to gender, region, and age of 5 years (10-14 years old, 15-19 years old, 20-24 years old) using suicide death data from the Korea National Statistical Office from 2000 to 2017. The cohort of interest in the study is the group that was in childhood and early adolescence between 1997-2000 and corresponds to 1986-1995 in terms of birth year. Cohorts are divided into 1986-1989 (G1), 1990-1992 (G2), and 1993-1995 (G3) according to birth year. These groups were 8-14 years old for G1 and 5-10 years old for G2, 2-7 years old for G3 during 1997-2000, during the economic crisis. The Age-Period-Cohort analysis and linear mixed-effects regression models are used and the moderating effect on region and age is also analyzed. Results The 10-24 year-old suicide rate was higher in males than females, in older age groups, earlier in birth years in the birth cohort, and in rural than urban areas. Suicide rates between the ages of 20-24 years were particularly high among men living in rural areas. During the national economic crisis, the suicide rate was higher among adolescents than preschoolers (G3 < G1) (p