The behavioural patterns of individuals in the same species are very diverse. The phenomenon in which different behavioural phenotypes are maintained in the same species for long time can be explained by niche specialization or frequency dependent selection, but it has not been proven yet. Especially, the high prevalence of mental illnesses as extreme behaviour patterns is one of the challenges of evolutionary psychology. From an evolutionary point of view, several frameworks for studying various patterns of behaviours or psychopathologies may be proposed. In this paper, I briefly explain animal models, personality factor models, DSM-IV multiaxial models, FSD models, and RDoC models, and discuss their advantages and disadvantages, focusing on the evolutionary approach to behavioural variation among individuals.
Diagnostic and Statistical Manual of Mental Disorders ; Models, Animal ; Phenotype ; Prevalence ; Psychology ; Psychopathology

OBJECTIVE: To examine the association between psychiatric disorders and neoplasms. METHODS: A follow-up study of a population-based cohort of patients admitted for psychiatric care between the ages 13–17 years. The cases were patients with a follow-up diagnosis of neoplasm. The K-SADS-PL interview was used to assess DSM-IV based psychiatric diagnoses at adolescence. The treatment episodes due to neoplasms and related psychiatric disorders were extracted from the National Health Care Registers. RESULTS: Of the original cohort, 6.3% of subjects had a neoplasm diagnosis. Male cases were characterized as taking snuff and females as having a fear of becoming obese. 75% of cases had smoked regularly and 47% suffered from substance misuse disorder already in adolescence. At a mean age of 22 years, the diagnoses of skin or soft tissue neoplasms were prevailing, three being malignant neoplasms of the skin, mouth or colon. Non-psychotic disorders were comorbid both two years before (26%) and after (33%) the neoplasm diagnosis. CONCLUSION: Focus on psychiatric symptoms of patients with neoplasms may enhance their treatment outcome and quality of life.
Adolescent ; Cohort Studies ; Colon ; Delivery of Health Care ; Diagnosis ; Diagnostic and Statistical Manual of Mental Disorders ; Female ; Follow-Up Studies ; Humans ; Inpatients ; Male ; Mouth ; Prevalence ; Quality of Life ; Skin ; Smoke ; Soft Tissue Neoplasms ; Tobacco, Smokeless ; Treatment Outcome ; Young Adult

BACKGROUND: Few studies have examined the association between childhood bullying and adulthood mental disorders based on the Diagnostic and Statistical Manual of Mental Disorders (DSM) criteria. We investigated the association of childhood peer bullying with Diagnostic and Statistical Manual of Mental Disorders, fourth edition (DSM-IV) psychiatric disorders and suicidality in adults. METHODS: A total of 5,102 respondents aged 18 or over completed the Korean version of the Composite International Diagnostic Interview for DSM-IV psychiatric disorders and a questionnaire for suicidal ideas, plans, and attempts. We evaluated peer bullying using an item in the Adverse Childhood Experiences International Questionnaire. Logistic regression analyses were used to identify the association between victimization of peer bullying, adult psychiatric disorders, and suicidality. RESULTS: Around 8.8% of the general population in Korea reported the experience of being bullied when growing up. Bullying experience was associated with an increase in the adulthood prevalence of nicotine use disorders (adjusted odds ratio [aOR], 2.47; 95% confidence interval [CI], 1.75–3.49), alcohol use disorders (aOR, 1.93; 95% CI, 1.49–2.51), mood disorders (aOR, 4.23; 95% CI, 3.01–5.94), and anxiety disorders (aOR, 2.89; 95% CI, 1.89–4.43) after adjusting for sociodemographic variables. Among anxiety disorders, the OR for post-traumatic stress disorder (aOR, 9.95; 95% CI, 5.62–17.63) was notably high. Frequent victimization (many times) was significantly associated with suicidality even after adjusting for sociodemographic variables and lifetime prevalence of psychiatric disorders, whereas occasional victimization (once or a few times) was not. CONCLUSION: Childhood bullying experience was associated with adult psychiatric disorders and suicidality. The findings indicated the importance of the early detection and management of childhood peer bullying to reduce detrimental adulthood consequences.
Adult ; Anxiety Disorders ; Bullying ; Crime Victims ; Cross-Sectional Studies ; Diagnostic and Statistical Manual of Mental Disorders ; Humans ; Korea ; Logistic Models ; Mental Disorders ; Mood Disorders ; Odds Ratio ; Prevalence ; Stress Disorders, Post-Traumatic ; Suicide ; Surveys and Questionnaires ; Tobacco Use Disorder

OBJECTIVE: Despite the increasing number of North Korean defectors, research on their mental health conditions and suicidal thoughts and behaviors has not been conducted systematically. We examined the prevalence and risk factors of suicidal thoughts and behaviors in North Korean defectors. METHODS: This study focused on 300 North Korean defectors recruited from regional resettlement centers in South Korea. In-person interviews based on the North Korean version of the Composite International Diagnostic Interview were conducted to diagnose mental disorders and assess suicidal thoughts and behaviors. Logistic regression analyses were performed to evaluate the association between suicidal thoughts and behaviors and socio-demographic variables, and DSM-IV mental disorders. RESULTS: Lifetime prevalence of suicidal ideation, plans, and attempts were 28.3, 13.3, and 17.3%, respectively. Female sex (OR: 2.0, 95% CI: 1.0–3.9), presence of health problems in the past year (2.6, 95% CI: 1.4–4.6), and absence of both South Korean acquaintances (1.9, 95% CI: 1.0–3.4) and North Korean family (1.7, 95% CI: 1.0–2.9) were associated with higher odds of suicidal thoughts and behaviors, after adjusting for participant age, sex, and education. Presence of a mental disorder was associated with a significantly increased odd of suicide ideation, plan, and attempt. Of all mental disorder categories, agoraphobia had the strongest association with suicidal ideation (6.5, 95% CI: 2.0–21.6), plans (7.7, 95% CI: 2.5–23.2) and attempts (12.0, 95% CI: 3.5–40.8). CONCLUSION: Suicidal thoughts and behaviors among North Korean defectors are higher than the general population in South Korea, especially show high rates in transit countries. Further study should focus on the changes in suicidal thoughts and behaviors according to the settlement process and early prevention.
Agoraphobia ; Diagnostic and Statistical Manual of Mental Disorders ; Education ; Female ; Friends ; Humans ; Korea ; Logistic Models ; Mental Disorders ; Mental Health ; Prevalence* ; Risk Factors ; Suicidal Ideation ; Suicide

OBJECTIVES: The objective of this study was to investigate the concordance of Diagnostic and Statistical Manual of Mental Disorders (DSM-IV and DSM-5) diagnostic criteria for autism spectrum disorder (ASD). METHODS: We retrospectively reviewed the medical records of 170 subjects (age range: 3–23, 140 boys) with developmental delay or social deficit from January 2011 to July 2016 at the Department of Psychiatry of Asan Medical Center. The Autism Diagnostic Interview-Revised (ADI-R), the Autism Diagnostic Observation Schedule (ADOS), and intelligence tests were performed for each subject. Diagnosis was reviewed and confirmed for each subject with DSM-IV Pervasive Developmental Disorder (PDD) and DSM-5 ASD criteria, respectively. RESULTS: Fifty-eight of 145 subjects (34.1%) who were previously diagnosed as having PDD in DSM-IV did not meet DSM-5 ASD criteria. Among them, 28 (48.3%) had Asperger's disorder based on DSM-IV. Most algorithm scores on ADOS and all algorithm scores on ADI-R were highest in subjects who met both DSM-IV PDD criteria and DSM-5 ASD criteria (the Convergent group), followed by subjects with a DSM-IV PDD diagnosis who did not have a DSM-5 ASD diagnosis (the Divergent group), and subjects who did not meet either DSM-IV PDD or DSM-5 ASD criteria (the non-PDD group). Intelligence quotient was lower in the Convergent group than in the Divergent group. CONCLUSION: The results of our study suggest that ASD prevalence estimates could be lower under DSM-5 than DSM-IV diagnostic criteria. Further prospective study on the impact of new DSM-5 ASD diagnoses in Koreans with ASD is needed.
Appointments and Schedules ; Asperger Syndrome ; Autism Spectrum Disorder* ; Autistic Disorder* ; Chungcheongnam-do ; Diagnosis* ; Diagnostic and Statistical Manual of Mental Disorders ; Intelligence ; Intelligence Tests ; Medical Records ; Prevalence ; Prospective Studies ; Retrospective Studies

OBJECTIVE: To form a new assessment method to evaluate postural workload comprehensively analyzing the dynamic and static postural workload for workers during their work process to analyze the reliability and validity, and to study the relation between workers' postural workload and work-related musculoskeletal disorders (WMSDs). METHODS: In the study, 844 workers from electronic and railway vehicle manufacturing factories were selected as subjects investigated by using the China Musculoskeletal Questionnaire (CMQ) to form the postural workload comprehensive assessment method. The Cronbach's α, cluster analysis and factor analysis were used to assess the reliability and validity of the new assessment method. Non-conditional Logistic regression was used to analyze the relation between workers' postural workload and WMSDs. RESULTS: Reliability of the assessment method for postural workload: internal consistency analysis results showed that Cronbach's α was 0.934 and the results of split-half reliability indicated that Spearman-Brown coefficient was 0.881 and the correlation coefficient between the first part and the second was 0.787. Validity of the assessment method for postural workload: the results of cluster analysis indicated that square Euclidean distance between dynamic and static postural workload assessment in the same part or work posture was the shortest. The results of factor analysis showed that 2 components were extracted and the cumulative percentage of variance achieved 65.604%. The postural workload score of the different occupational workers showed significant difference (P<0.05) by covariance analysis. The results of nonconditional Logistic regression indicated that alcohol intake (OR=2.141, 95%CI 1.337-3.428) and obesity (OR=3.408, 95%CI 1.629-7.130) were risk factors for WMSDs. The risk for WMSDs would rise as workers' postural workload rose (OR=1.035, 95%CI 1.022-1.048). There was significant different risk for WMSDs in the different groups of workers distinguished by work type, gender and age. Female workers exhibited a higher prevalence for WMSDs (OR=2.626, 95%CI 1.414-4.879) and workers between 30-40 years of age (OR=1.909, 95%CI 1.237-2.946) as compared with those under 30. CONCLUSION This method for comprehensively assessing postural workload is reliable and effective when used in assembling workers, and there is certain relation between the postural workload and WMSDs.
China ; Factor Analysis, Statistical ; Female ; Humans ; Logistic Models ; Male ; Musculoskeletal Diseases ; Posture ; Prevalence ; Reproducibility of Results ; Risk Factors ; Surveys and Questionnaires ; Workload

Objective: To evaluate the prevalence and trend of diabetes mellitus among Chinese adults during the past thirty years. Methods: Papers, published before October 1, 2017 and related to the prevalence of diabetes mellitus among Chinese adults, were searched through PubMed, China Knowledge Resource Integrated Database, Wanfang Digital Database and VIP Citation Databases. Stata 13.0 software was used to estimate the prevalence of diabetes mellitus, with pooled prevalence calculated based on random effects. Subgroup analysis was conducted based on time, sex, areas and body mass index groups of investigation. Continuous fractional polynomial regression model on the midpoint of each survey period, weighted by the number of participants in each study, was used to estimate and illustrate the trends of prevalence of diabetes over the years. Results: In total, 15 studies were included and two of them were excluded in the primary analysis with the age limitation of participants as ≥40 years old, for recruitment. The average prevalence of diabetes among Chinese adults was 6.3% (95%CI: 4.6%-8.0%), during the past thirty years. The pooled prevalence appeared higher in urban than in rural areas and higher in men than in women. Between 1980 and 2013, the increase of Chinese diabetes prevalence did not follow the linear trend. Before 2000, the average prevalence showed as 3.5% (95%CI: 2.0%-4.9%), with an annual increase rate as 0.17%. Since 2000, the average annual prevalence of diabetes mellitus had appeared around 8.0% (95%CI: 6.0%-10.1%), with an annual growth rate of 0.72% (95%CI: 0.34%-1.10%). Conclusion: The prevalence of diabetes in Chinese adults had been rapidly increasing since the year 2000, indicating that efforts should be strengthened for diabetes prevention, in China.
Adult ; Asian People/statistics & numerical data* ; Body Mass Index ; China/epidemiology* ; Diabetes Mellitus/ethnology* ; Female ; Humans ; Male ; Models, Statistical ; Prevalence ; Rural Population ; Sex Distribution ; Surveys and Questionnaires ; Urban Population

OBJECTIVES: Little information exists on the association between comorbidities of mental disorders and suicidal ideation in developing countries. The current study examined the relationship between the presence of comorbid mental disorders and suicidal ideation in the adult population. METHODS: This cross-sectional study was conducted using the cluster random sampling method in 3 steps. Data were collected from a household assets survey and the self-administered 28-item General Health Questionnaire as first step in screening, and the Persian version of the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition - Text Revision was used in the second stage to determine the prevalence of mental disorders. Bivariate and multivariate analysis were used to investigate the associations between mental disorders and suicidal ideation. RESULTS: Of the 763 participants, 199 (26.1%) had 1 or more mental disorder. Forty-two (71.4%) subjects with comorbidities had a history of suicidal ideation, whereas 59 (7.7%) of all participants had a history of suicidal ideation. We found that major depressive disorder and obsessive-compulsive disorder were the most predictive of suicidal ideation in both sexes. The odds ratio for suicidal ideation associated with having 3 comorbid disorders was 2.70 (95% confidence interval [CI], 1.40 to 14.12) in males and 3.06 (95% CI, 1.25 to 15.22) in females. CONCLUSIONS: Consistent with pervious data, our results confirmed that mental disorders and comorbidities of mental disorders were important predictors of suicidal ideation. Our findings are very useful for applied intervention programs to reduce the suicide rate in regions in which it is high.
Adult* ; Comorbidity* ; Cross-Sectional Studies ; Depressive Disorder, Major ; Developing Countries ; Diagnostic and Statistical Manual of Mental Disorders ; Family Characteristics ; Female ; Humans ; Male ; Mass Screening ; Mental Disorders* ; Methods ; Multivariate Analysis ; Obsessive-Compulsive Disorder ; Odds Ratio ; Prevalence* ; Suicidal Ideation* ; Suicide

OBJECTIVES: Little information exists on the association between comorbidities of mental disorders and suicidal ideation in developing countries. The current study examined the relationship between the presence of comorbid mental disorders and suicidal ideation in the adult population.METHODS: This cross-sectional study was conducted using the cluster random sampling method in 3 steps. Data were collected from a household assets survey and the self-administered 28-item General Health Questionnaire as first step in screening, and the Persian version of the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition - Text Revision was used in the second stage to determine the prevalence of mental disorders. Bivariate and multivariate analysis were used to investigate the associations between mental disorders and suicidal ideation.RESULTS: Of the 763 participants, 199 (26.1%) had 1 or more mental disorder. Forty-two (71.4%) subjects with comorbidities had a history of suicidal ideation, whereas 59 (7.7%) of all participants had a history of suicidal ideation. We found that major depressive disorder and obsessive-compulsive disorder were the most predictive of suicidal ideation in both sexes. The odds ratio for suicidal ideation associated with having 3 comorbid disorders was 2.70 (95% confidence interval [CI], 1.40 to 14.12) in males and 3.06 (95% CI, 1.25 to 15.22) in females.CONCLUSIONS: Consistent with pervious data, our results confirmed that mental disorders and comorbidities of mental disorders were important predictors of suicidal ideation. Our findings are very useful for applied intervention programs to reduce the suicide rate in regions in which it is high.
Adult ; Comorbidity ; Cross-Sectional Studies ; Depressive Disorder, Major ; Developing Countries ; Diagnostic and Statistical Manual of Mental Disorders ; Family Characteristics ; Female ; Humans ; Male ; Mass Screening ; Mental Disorders ; Methods ; Multivariate Analysis ; Obsessive-Compulsive Disorder ; Odds Ratio ; Prevalence ; Suicidal Ideation ; Suicide

OBJECTIVES: This exploratory study was designed to estimate the socio-demographic characteristics, course of homelessness, adverse childhood experiences, and prevalence of mental disorders among the street homeless people in Seoul, Korea. In addition, we examined the associations between chronic homelessness and study variables. METHODS: The study subjects were 75 homeless people dwelling in the street around Seoul Station. Questionnaires related to socio-demographic data and the course of homelessness were provided to each subject. The subjects' Diagnostic and Statistical Manual of Mental Disorders, fourth edition (DSM-IV) mental disorder diagnoses were made by using Mini International Neuropsychiatric Interview-Plus interviews. RESULTS: Most subjects exhibited chronic homelessness and the prevalence of DSM-IV mental disorders among the homeless subjects was higher than that among the Korean general population. There was a statistically significant association between chronic homelessness and adverse childhood experiences. Compared to those with no history of childhood adversity, homeless people with a history of childhood adversity had a younger age of first homeless episode and a higher prevalence of DSM-IV major mental disorders. The association between DSM-IV diagnosis and chronic homelessness was not significant, but the group with mental disorders had more prevalent re-housing and homeless recurrent histories. CONCLUSION: Street homeless people were often involved in chronic homelessness. Results of this study suggest that homeless people who were never married and had adverse childhood experiences were more vulnerable to chronic homelessness. In addition, we detected a possible relationship between the recurrence of homelessness and the presence of mental disorders.
Diagnosis ; Diagnostic and Statistical Manual of Mental Disorders ; Homeless Persons* ; Humans ; Korea ; Mental Disorders ; Prevalence ; Recurrence ; Seoul ; Single Person