Neighbourhood ethnic density and psychosis - Is there a difference according to generation?

BACKGROUND: For different migrant groups living in an area with few people from the same ethnic background is associated with increased psychosis incidence (the ethnic density effect). We set out to answer the question: are there generational differences in this effect? METHODS: Analysis of a population based cohort (2.2 million) comprising all those born 1st January 1965, or later, living in Denmark on their 15th birthday. This included 90,476 migrants from Africa, Europe (excluding Scandinavia) and the Middle East, with 55% first generation and the rest second-generation migrants. Neighbourhood co-ethnic density was determined at age 15 and we adjusted for age, gender, calendar period, parental psychiatric history and parental income. RESULTS: For first-generation migrants from Africa, there was no statistically significant difference (p=0.30) in psychosis rates when comparing lowest with highest ethnic density quintiles, whereas the second generation showed a 3.87-fold (95% CI 1.77-8.48) increase. Similarly, for migrants from the Middle East, the first generation showed no evidence of an ethnic density effect (p=0.94) while the second showed a clear increase in psychosis when comparing lowest with highest quintiles, incidence rate ratio (IRR) 2.43 (95% CI, 1.18-5.00). For European migrants, there was some limited evidence of an effect in the first generation, (IRR) 1.69 (95% CI, 1.19-2.40), with this slightly raised in the second: IRR 1.80 (95% CI, 1.27-2.56). CONCLUSIONS: We found strong evidence for an ethnic density effect on psychosis incidence for second-generation migrants but this was either weak or absent for the first generation.

Ethnic density, urbanicity and psychosis risk for migrant groups - A population cohort study.

BACKGROUND: Rates of psychotic disorder are raised for many migrant groups. Understanding the role played by the social context in which they live may help explain why. This study investigates the effect of both neighbourhood ethnic density and urbanicity on the incidence of non-affective psychosis for migrant groups. METHOD: Population based cohort of all those born 1965 or later followed from their 15th birthday (2,224,464 people) to 1st July 2013 (37,335,812 person years). Neighbourhood exposures were measured at age 15. RESULTS: For all groups incidence of non-affective psychosis was greater in lower ethnic density neighbourhoods. For migrants of African origin there was a 1.94-fold increase (95% CI, 1.17-3.23) comparing lowest and highest density quintiles; with similar effects for migrants from Europe (excluding Scandinavia): incidence rate ratio (IRR) 1.99 (95% CI, 1.56-2.54); Asia: IRR 1.63 (95% CI, 1.02-2.59); and the Middle East: IRR 1.68 (95% CI, 1.19-2.38). This initial analysis found no evidence for an urbanicity effect for migrant groups. Adjusting for ethnic density revealed a positive association between level of urbanicity and psychosis for two groups, with a statistically significant linear trend (average effect of a one quintile increase) for migrants from Europe: IRR 1.09 (95% CI, 1.02-1.16) and the Middle East: IRR 1.12 (95% CI, 1.01-1.23). CONCLUSIONS: In this first nationwide population-based study of ethnic density, urbanicity and psychosis we show that lower ethnic density is associated with increased incidence of non-affective psychosis for different migrant groups; masking urban/rural differences in psychosis for some groups.

Increased Risk of Mortality Due to Interpersonal Violence in Foreign-Born Women of Reproductive Age: A Swedish Register-Based Study.

Violence against women is an increasing public health concern, with assault leading to death as the most extreme outcome. Previous findings indicate that foreign-born women living in Sweden are more exposed to interpersonal violence than Swedish-born women. The current study investigates mortality due to interpersonal violence in comparison with other external causes of death among women of reproductive age in Sweden, with focus on country of birth. Foreign-born women and especially those from countries with low and very low gender equity levels had increased risk of mortality due to interpersonal violence, thus implicating lack of empowerment as a contributing factor.

Attempted suicide and violent criminality among Danish second-generation immigrants according to parental place of origin.

BACKGROUND: Immigrant populations in Western European countries have grown in their size and diversity, but little is known about risks of self-directed and externalised violence among second-generation immigrants. AIMS: To compare risks for attempted suicides and violent offending among second-generation immigrants to Denmark according to parental region of origin versus the native Danish population. METHODS: Data from interlinked national Danish registers were used (N = 1,973,614). Parental origin outside Denmark was categorised thus: Asia, Africa, Middle East, Greenland, other Scandinavian countries, elsewhere in Europe and all other regions. We estimated gender-specific cumulative incidence and incidence rate ratios (IRRs) versus native Danes. RESULTS: In virtually all subgroups of second-generation immigrants, risk was elevated for the two adverse outcomes in both genders. Females generally had greater elevations in attempted suicide risk, and males had greater elevations in violent offending risk. For attempted suicide, especially large IRRs were observed for males and females whose parents emigrated from Greenland; for violent offending, risks were particularly raised for males and females of Middle Eastern, Greenlandic and African origin. Adjustment for socioeconomic status partially explained these associations. CONCLUSION: Western European nations should develop preventive programmes tailored towards specific second-generation immigrant populations, with integrated approaches jointly tackling suicidality and violence.

Trauma and Poor Mental Health in Relation to Economic Status: The Case of Cambodia 35 Years Later.

BACKGROUND: Cambodia is one of the poorest countries in south-east Asia and is still emerging from the events of the Khmer Rouge reign. It has been suggested that the atrocities experienced by the Cambodian population can explain why Cambodia continues to lag behind its neighbours in economic outcomes. The purpose of this study is to investigate whether there is an association between exposure to past trauma and/or current poor mental health and current economic status in Cambodia. METHOD: A newly conducted survey performed in two regions (north-west and south-east Cambodia) collected information on trauma exposure, psychiatric symptoms, self-rated health outcomes and socio-economic information for 3200 persons aged 18-60. Economic outcomes were measured as household debt and poverty status and whether the respondent was economically inactive. All models were analysed using logistic regression. RESULTS: No association was found between high exposure to conflict-related or civilian trauma and any economic outcomes save for a negative association between civilian trauma and poverty in the south-east. Current post-traumatic stress was related solely to poverty status. All other measures of current mental health status, however, were found to be strongly negatively associated with all measures of economic status. Thus, mental health interventions could potentially be utilised in poverty reduction strategies, but greater efficacy is likely to be achieved by targeting current mental health status rather than previous trauma exposure.

Sexual Risk Behavior, Sexual Violence, and HIV in Persons With Severe Mental Illness in Uganda: Hospital-Based Cross-Sectional Study and National Comparison Data.

OBJECTIVES: We investigated prevalence of past-year sexual risk behavior and sexual violence exposure in persons with severe mental illness (SMI) in Uganda, and compared results to general population estimates. We also investigated whether persons with SMI reporting sexual risk behavior and sexual violence exposure were more likely to be HIV-infected. METHODS: We included 602 persons consecutively discharged from Butabika Hospital, Kampala, Uganda, February to April 2010. We asked about past-year number of sexual partners and condom use. We assessed sexual violence with the World Health Organization Violence Against Women Instrument. We performed HIV testing. We used data from 2011 Uganda Demographic and Health Survey for comparison. RESULTS: Women with SMI had more sexual risk behavior and more sexual violence exposure than women in the general population. We found no difference in sexual risk behavior in men. Sexual risk behavior was associated with HIV infection in men, but not women. Sexual violence exposure was not associated with HIV infection in women. CONCLUSIONS: Findings suggest that SMI exacerbates Ugandan women's sexual vulnerability. Public health practitioners, policymakers, and legislators should act to protect health and rights of women with SMI in resource-poor settings.

Long-term psychiatric consequences of exposure to trauma in Cambodia: a regional household survey.

The long-term psychiatric consequences of exposure to war and/or mass conflict continue to be of great concern and particularly in Cambodia. The current cross-sectional study examined the relationship between history of trauma and current psychiatric and functional morbidity in 3200 randomly selected adults aged 18-60 in Cambodia. Structured interviews were conducted from November 2011 until May 2012 in two predominantly rural regions purposively selected for differing duration of exposure to the Khmer Rouge occupation. Information was also collected regarding ongoing daily stressors and intimate partner violence. Despite high prevalence rates of conflict/war-related trauma, current rates of psychiatric disorders (depression, post-traumatic stress disorder) were relatively low, suggesting that the effects of trauma and extreme hardship in civilian populations may be modified by contextual factors and/or the passage of time. Poor to fair physical health was, however, reported by nearly 60% of the sample. Daily stressors were more important for current morbidity levels than history of trauma, especially in the region with shorter Khmer Rouge occupation. The results suggest that a focus exclusively on past trauma may overlook the contribution of adverse daily life circumstances towards current levels of well-being in civilian populations affected by war and/or mass conflict.

Intimate partner violence and poor mental health among Thai women residing in Sweden.

OBJECTIVES: The current aim is to examine the prevalence of intimate partner violence (IPV) among Thai women residing in Sweden and its association with mental health. We also investigate the potential influence of social isolation and social capital regarding the association between IPV and mental health outcome. DESIGN: A public health questionnaire in Thai was distributed by post to the entire population of Thai women, aged 18-64, residing in two regions in Sweden since 2006. Items included aspects related to IPV (physical/sexual/emotional), sociodemographic background, physical health, mental health (GHQ-12), social isolation, and social capital (i.e. social trust/participation). RESULTS: The response rate was 62.3% (n=804). Prevalence of lifetime reported IPV was 22.1%, with 20.5% by a previous partner and 6.7% by a current partner. Previous IPV exposure was significantly related to current IPV exposure, and all IPV exposure measures were significantly related to poor mental health. However, Thai women experiencing IPV by a current partner were more at risk for poor mental health than Thai women with previous or without any experience of IPV. Also, among all women exposed to IPV, those with trust in others and without exposure to social isolation seemed to have partial protection against the adverse mental health consequences associated with IPV. CONCLUSIONS: Most Thai women had never been exposed to IPV, and after migrating to Sweden, women had lower IPV exposure than in Thailand. However, the increased risk for poor mental health among those Thai women exposed to IPV suggests the need for supportive measures and targeted interventions to prevent further injuries and adverse health consequences. Although poor mental health in Thai women represents an obstacle for integration, the potential resilience indicated in the group with high social trust and without exposure to social isolation suggests that such aspects be included in the program designed to facilitate integration.

The social defeat hypothesis of schizophrenia: an update.

According to the social defeat (SD) hypothesis, published in 2005, long-term exposure to the experience of SD may lead to sensitization of the mesolimbic dopamine (DA) system and thereby increase the risk for schizophrenia. The hypothesis posits that SD (ie, the negative experience of being excluded from the majority group) is the common denominator of 5 major schizophrenia risk factors: urban upbringing, migration, childhood trauma, low intelligence, and drug abuse. The purpose of this update of the literature since 2005 is to answer 2 questions: (1) What is the evidence that SD explains the association between schizophrenia and these risk factors? (2) What is the evidence that SD leads to sensitization of the mesolimbic DA system? The evidence for SD as the mechanism underlying the increased risk was found to be strongest for migration and childhood trauma, while the evidence for urban upbringing, low intelligence, and drug abuse is suggestive, but insufficient. Some other findings that may support the hypothesis are the association between risk for schizophrenia and African American ethnicity, unemployment, single status, hearing impairment, autism, illiteracy, short stature, Klinefelter syndrome, and, possibly, sexual minority status. While the evidence that SD in humans leads to sensitization of the mesolimbic DA system is not sufficient, due to lack of studies, the evidence for this in animals is strong. The authors argue that the SD hypothesis provides a parsimonious and plausible explanation for a number of epidemiological findings that cannot be explained solely by genetic confounding.

HIV prevalence in persons with severe mental illness in Uganda: a cross-sectional hospital-based study.

BACKGROUND: In Uganda, a previous study reported high HIV prevalence in persons with severe mental illness (SMI) compared to the general population, suggesting that persons with SMI might constitute a high-risk group for HIV. However, the study included first-time psychiatric admissions only, a group whose HIV prevalence may not reflect the prevalence in persons with SMI in general. We determined prevalence and correlates of HIV in both first-time and previous psychiatric admissions, in a psychiatric hospital in Uganda. METHODS: Cross-sectional study of HIV status in persons consecutively discharged from psychiatric admission wards in Butabika hospital, Uganda. INCLUSION CRITERIA: age 18-49 years; schizophrenia, bipolar disorder, depression, or other non-substance-use-related psychosis; Luganda or English proficiency. Exclusion criterion: Mental incapacity to give informed consent. Participants were HIV-tested, and interviewed using a structured questionnaire. Data were analysed using logistic regression. RESULTS: HIV prevalence was 11.3% (CI 8.8-13.8) overall, 7.3% (CI 4.1-10.5) in men and 14.3% (CI 10.6-18.0) in women. Females had higher risk of HIV infection than males (OR 2.10; CI 1.20-3.67), after adjustment for age. Older patients had higher risk of HIV infection than younger patients (40-49 vs. 18-29 years: OR 2.34; CI 1.27-4.32), after adjustment for sex. Place of residence, marital status, income, education, occupation, psychiatric diagnosis and history of previous admission were not associated with HIV infection, after adjustment for sex and age. The above associations did not significantly differ between men and women. CONCLUSIONS: Persons admitted for SMI in Uganda have higher HIV prevalence than persons in the general population, irrespective of previous admissions. The excess HIV prevalence is mainly confined to women. The findings call for the integration of HIV prevention, testing and care with mental health services in settings with generalized HIV epidemics. Moreover, further research is needed to clarify the mechanisms underlying the increased HIV prevalence in women with SMI in Uganda, and to identify effective community-based interventions for this vulnerable group.

Full spectrum of psychiatric disorders related to foreign migration: a Danish population-based cohort study.

IMPORTANCE: Although increased risk for schizophrenia among immigrants is well established, knowledge of the broader spectrum of psychiatric disorders associated with a foreign migration background is lacking. OBJECTIVE: To examine the full range of psychiatric disorders associated with any type of foreign migration background among persons residing in Denmark, including foreign-born adoptees, first- and second-generation immigrants, native Danes with a history of foreign residence, and persons born abroad to Danish expatriates. DESIGN AND SETTING: Danish population-based cohort study. Persons were followed up from their 10th birthday for the development of mental disorders based on outpatient and inpatient data. PARTICIPANTS: All persons born between January 1, 1971, and December 31, 2000 (N = 1 859 419) residing in Denmark by their 10th birthday with follow-up data to December 31, 2010. MAIN OUTCOME MEASURES: Incidence rate ratios (IRRs) and cumulative incidences for psychiatric outcomes. RESULTS: All categories of foreign migration background, except persons born abroad to Danish expatriates, were associated with increased risk for at least 1 psychiatric disorder. Foreign-born adoptees had increased IRRs for all psychiatric disorders and had the highest IRRs for these disorders compared with other foreign migration categories. First- and second-generation immigrants having 2 foreign-born parents had significantly increased IRRs for schizophrenia and schizophrenia spectrum disorders and had similar risk magnitudes. Second-generation immigrants having 1 foreign-born parent had significantly increased IRRs for all psychiatric disorders. Native Danes with a history of foreign residence had increased IRRs for bipolar affective disorder, affective disorders, personality disorders, and schizophrenia spectrum disorders. CONCLUSIONS AND RELEVANCE: The extent to which a background of foreign migration confers an increased risk for the broad spectrum of psychiatric disorders varies according to parental origin, with greatest risks for foreign-born adoptees. The spectrum of psychiatric disorders showed greater variation within the second-generation immigrant group than between first-generation vs second-generation immigrants, and the spectrum differed according to whether individuals had 1 or 2 foreign-born parents.

The invisible suffering: sexual coercion, interpersonal violence, and mental health--a cross-sectional study among university students in south-western Uganda.

BACKGROUND: Despite a history of conflicts and widespread human rights violation in sub-Saharan Africa, little is known about the prevalence of interpersonal violence among the population in this region. Evidence from high-income countries suggests that exposure to violence has mental health consequences and violence also has associations with experiences of sexual coercion. AIMS: This study sought to investigate the prevalence of physical and perceived threats of violence among university students in Uganda and to assess the possible relationship between such violence, sexual coercion, and symptoms of anxiety, depression, and psychoticism, respectively. METHOD: In 2005, 980 Ugandan university students responded to a self-administered questionnaire (response rate 80%) that assessed socio-demographic factors, social capital, importance of religion, mental health, experience of violence and sexual coercion, and sexual behaviour factors. Logistic regression analysis was applied as the main analytical tool. RESULTS: Of those who responded, 28% reported perceived threats/threats of violence and 10% exposure to actual physical violence over the previous 12 months, with no significant gender differences in exposure history. Exposure to violence was significantly associated with the experience of sexual coercion among both males and females. Sexual coercion and threats/threats of violence were both significantly associated with poor mental health in males and females, but only males showed a strong association between exposure to physical violence and poor mental health. CONCLUSION: The current study suggests that in terms of general exposure, both males and females in the study population are equally exposed to sexual coercion and interpersonal violence, and both male and female students show generally similar mental health effects of exposure to such violence. The prevalence of interpersonal violence found in our study population may have long-term negative health implications. Our findings may serve as a baseline for interventions and continuing research aimed at preventing interpersonal violence.

Youth, sexual risk-taking behavior, and mental health: a study of university students in Uganda.

BACKGROUND: Little focus has been paid to the role of mental health among young people with regard to risky sexual behavior and HIV prevention in sub-Saharan Africa. The aim of this study was to investigate the relationship between poor mental health and risky sexual behavior (HIV/AIDS) among a population of university students in Uganda. METHODS: In 2005, 980 Ugandan university students completed a self-administered questionnaire (response rate 80%) assessing sociodemographic and religious background factors, mental health, alcohol use, and sexual behavior. Mental health was assessed using items from the Hopkins Symptoms Checklist-25 and the Symptom Checklist-90. RESULTS: High scores on depression and high numbers of sexual partners among both males (odds ratio (OR) 2.0, 95% confidence interval (CI) 1.2-3.3) and females (OR 3.3, 95% CI 1.3-8.6) were significantly associated. Elevated anxiety scores among men were associated with high numbers of sexual partners (OR 1.9, 95% CI 1.1-3.3) and inconsistent condom use (OR 1.9, 95% CI 1.1-3.6). Psychoticism was also significantly associated with high numbers of sexual partners among men. The associations remained statistically significant after controlling for sociodemographic factors and level of alcohol consumption. CONCLUSION: These findings indicate that previous conclusions on the association between sexual behavior and mental health from high- and middle-income countries also are valid in a low-income setting, such as in Uganda. This knowledge has implications for policy formation and HIV/AIDS preventive strategies. Coordinated youth-friendly mental health and sexual and reproductive health services to meet the needs of young people would be desirable.

Perceived threat of violence and exposure to physical violence against foreign-born women: a Swedish population-based study.

BACKGROUND: Violence against women is an increasing global phenomenon. Little is known about violence against foreign-born women, despite a possible increased concentration of risk factors in this group. METHODS: This study investigated prevalence of perceived threat of violence and exposure to physical violence and its relation to country of birth among women (18-64 years) residing in southern Sweden, using data obtained from the 2004 Public Health Survey in Scania, Sweden. FINDINGS: Foreign-born women reported significantly higher rates of both perceived threat of violence and exposure to physical violence compared with Swedish-born women. Foreign-born women exposed to violence originated primarily from middle/low-income countries (versus high-income countries). The risk of perceived threat of violence remained significantly increased among foreign-born even after further adjustment for potential confounders, such as marital status and disposable income. After similar adjustment, increased exposure to physical violence was no longer significantly related to foreign-born status, but instead was largely attributable to marital status and low levels of disposable income. Foreign-born women, however, had a greater risk of physical violence in the home than Swedish-born women, and violence in the home was the most frequently reported setting for violence exposure among foreign-born women. CONCLUSION: Migration may confer an increased risk of interpersonal violence against women. Although the underlying causes of this increased risk are unknown, a complex set of factors may be involved, including socioeconomic disadvantage.

Do risk factors for schizophrenia predispose to emigration?

OBJECTIVE: Increased incidence rates of schizophrenia in immigrants still lack a satisfactory explanation. The aim of this study was to examine the hypothesis that risk factors for schizophrenia also increase the risk of emigration to a foreign country. If valid, Danes emigrating from Denmark carry a higher predisposition to develop schizophrenia compared to Danes living in Denmark. METHODS: Utilizing data from the Danish Civil Registration System, we established a population-based cohort of 1.10 million native Danes. We assessed relative risks of emigration to a foreign country in relation to sex, age, urban birth, parental age, and a history of mental illness. RESULTS: Urban birth in Denmark was a significant predictor of emigration to a foreign country. A maternal history of psychiatric contact during childhood and a parental history of bipolar affective disorder increased the risks of emigration. A personal history of mental illness decreased the risk of emigration, mostly for people diagnosed with schizophrenia. CONCLUSIONS: Our study provided evidence that Danish emigrants residing in a foreign country have both a higher predisposition of schizophrenia due to differential exposure to birth in urban areas and a lower predisposition of schizophrenia due to differential exposure to a history of mental illness. Although competing selection mechanisms operate, the combined effect of these different selection mechanisms was limited, thus suggesting a potential role for yet to be identified adverse environmental effects operating either before or after emigration.

Poor mental health and sexual risk behaviours in Uganda: a cross-sectional population-based study.

BACKGROUND: Poor mental health predicts sexual risk behaviours in high-income countries, but little is known about this association in low-income settings in sub-Saharan Africa where HIV is prevalent. This study investigated whether depression, psychological distress and alcohol use are associated with sexual risk behaviours in young Ugandan adults. METHOD: Household sampling was performed in two Ugandan districts, with 646 men and women aged 18-30 years recruited. Hopkins Symptoms Checklist-25 was used to assess the presence of depression and psychological distress. Alcohol use was assessed using a question about self-reported heavy-episodic drinking. Information on sexual risk behaviour was obtained concerning number of lifetime sexual partners, ongoing concurrent sexual relationships and condom use. RESULTS: Depression was associated with a greater number of lifetime partners and with having concurrent partners among women. Psychological distress was associated with a greater number of lifetime partners in both men and women and was marginally associated (p = 0.05) with having concurrent partners among women. Psychological distress was associated with inconsistent condom use among men. Alcohol use was associated with a greater number of lifetime partners and with having concurrent partners in both men and women, with particularly strong associations for both outcome measures found among women. CONCLUSION: Poor mental health is associated with sexual risk behaviours in a low-income sub-Saharan African setting. HIV preventive interventions should consider including mental health and alcohol use reduction components into their intervention packages, in settings where depression, psychological distress and alcohol use are common.

Urbanicity of place of birth and symptoms of psychosis, depression and anxiety in Uganda.

BACKGROUND: The mechanism underlying the association between urban birth/upbringing and increased schizophrenia risk is unknown. This study explored whether an urban effect might be present in a low-income country setting, where the ;urban' environment may have radically different components, for example urban architecture, pollution levels or social cohesion. AIMS: To investigate the potential association of urbanicity of place of birth and symptoms of psychosis, depression and anxiety in Uganda. METHOD: Ugandans aged 18-30 years (n = 646) were interviewed using the Peters et al Delusions Inventory (PDI-21), the Hopkins Symptoms Checklist (HSCL-25) and psychoticism items from the Symptoms Checklist 90-items version (SCL-90) in Mbarara and Kampala districts and asked about their birthplace. RESULTS: Urban birth (but not semi-urban) was associated with more lifetime psychotic experiences, especially grandiosity, and more symptoms of psychosis, depression and anxiety during the past week. CONCLUSIONS: The urban risk factor for schizophrenia may be universally present across different levels of human development, albeit the nature of the mechanism remains elusive.