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Background Knowledge of the association between parental personality disorders and mental disorders in children is limited. To examine the association between parental personality disorders and the risk of mental disorders in offspring. Methods We linked Danish health registers to create a cohort of children born from January 1, 1995, to December 31, 2016. Children were followed until their 18th birthday, diagnosis set, emigration, death, or December 31, 2016. Parental personality disorders according to the International Classification of Diseases (ICD) Eighth or 10th Revision. Poisson regression analyses were used to estimate the incidence risk ratio (IRR) and cumulative incidence of ICD 10th mental disorders in offspring (age 0–17). Results The study cohort included 1,406,965 children. For girls, maternal or paternal personality disorder (MPD/PPD) was associated with mental disorders: MPD girls (IRR, 2.74; 95% CI, 2.59–2.89) and PPD girls (IRR, 2.10; 95% CI, 1.94–2.27). Likewise, the risk was increased for both MPD boys (IRR, 2.44; 95% CI, 2.33–2.56) and PPD boys (IRR, 2.04; 95% CI, 1.91–2.18). For girls and boys combined, exposure to two parents with a personality disorder was associated with the highest risk (IRR, 3.69; 95% CI, 3.15–4.33). At age 18, the cumulative incidence of any mental disorder in children of one or two parents with a personality disorder was 34.1% (95% CI, 33.0–35.1), which was twice the cumulative incidence of mental disorders in nonexposed children (15.2% [95% CI, 15.1–15.3]). Conclusion Children of parents with a personality disorder were at a 2 to 3.5 times higher risk of mental disorders compared with nonexposed offspring. Possible mechanisms of transmission of mental disorders from parent to child involve genetic, environmental, and gene–environment pathways. More research into these mechanisms and research into preventive interventions is warranted., Background: Knowledge of the association between parental personality disorders and mental disorders in children is limited. To examine the association between parental personality disorders and the risk of mental disorders in offspring. Methods: We linked Danish health registers to create a cohort of children born from January 1, 1995, to December 31, 2016. Children were followed until their 18th birthday, diagnosis set, emigration, death, or December 31, 2016. Parental personality disorders according to the International Classification of Diseases (ICD) Eighth or 10th Revision. Poisson regression analyses were used to estimate the incidence risk ratio (IRR) and cumulative incidence of ICD 10th mental disorders in offspring (age 0–17). Results: The study cohort included 1,406,965 children. For girls, maternal or paternal personality disorder (MPD/PPD) was associated with mental disorders: MPD girls (IRR, 2.74; 95% CI, 2.59–2.89) and PPD girls (IRR, 2.10; 95% CI, 1.94–2.27). Likewise, the risk was increased for both MPD boys (IRR, 2.44; 95% CI, 2.33–2.56) and PPD boys (IRR, 2.04; 95% CI, 1.91–2.18). For girls and boys combined, exposure to two parents with a personality disorder was associated with the highest risk (IRR, 3.69; 95% CI, 3.15–4.33). At age 18, the cumulative incidence of any mental disorder in children of one or two parents with a personality disorder was 34.1% (95% CI, 33.0–35.1), which was twice the cumulative incidence of mental disorders in nonexposed children (15.2% [95% CI, 15.1–15.3]). Conclusion: Children of parents with a personality disorder were at a 2 to 3.5 times higher risk of mental disorders compared with nonexposed offspring. Possible mechanisms of transmission of mental disorders from parent to child involve genetic, environmental, and gene–environment pathways. More research into these mechanisms and research into preventive interventions is warranted.

Background Children of parents with mental illness have an increased risk of developing mental illness themselves throughout their lifespan. This is due to genetic factors but also environmental disadvantages during childhood associated with parental mental illness. Selective primary preventive interventions for the children are recommended to mitigate risk factors and strengthen protective factors, but large-scale, longitudinal studies are needed. This study aims to investigate the effect of the Family Talk Preventive Intervention in a cohort of children and their parents with mental illness. Methods The study is a randomized controlled trial with 286 planned families with at least one parent with any mental illness and at least one child aged 7 to 17 years. It will be carried out in the mental healthcare system in the Capital Region of Denmark. Families will be referred from hospitals and municipalities. The children and parents will be assessed at baseline and then randomized and allocated to either the Family Talk Preventive Intervention or service as usual. The intervention group will be assigned to Family Talk Preventive Intervention, a manualized programme consisting of ~ seven sessions for the family, including psychoeducation about parental mental illness and resilience in children, stimulating dialogue between family members and creating a common family narrative. The study period for both groups will be 12 months. Follow-up assessments will be conducted after 4 months and 12 months. The primary outcomes are the children’s level of functioning, parental sense of competence and family functioning. Discussion Given the prevalence of transgenerational transmission of mental illness, a systematic approach to prevention is needed in the mental healthcare setting. This study provides valuable knowledge on the Family Talk Preventive Intervention with a large sample size, inclusion of any parental mental illness and examination of the, Background: Children of parents with mental illness have an increased risk of developing mental illness themselves throughout their lifespan. This is due to genetic factors but also environmental disadvantages during childhood associated with parental mental illness. Selective primary preventive interventions for the children are recommended to mitigate risk factors and strengthen protective factors, but large-scale, longitudinal studies are needed. This study aims to investigate the effect of the Family Talk Preventive Intervention in a cohort of children and their parents with mental illness. Methods: The study is a randomized controlled trial with 286 planned families with at least one parent with any mental illness and at least one child aged 7 to 17 years. It will be carried out in the mental healthcare system in the Capital Region of Denmark. Families will be referred from hospitals and municipalities. The children and parents will be assessed at baseline and then randomized and allocated to either the Family Talk Preventive Intervention or service as usual. The intervention group will be assigned to Family Talk Preventive Intervention, a manualized programme consisting of ~ seven sessions for the family, including psychoeducation about parental mental illness and resilience in children, stimulating dialogue between family members and creating a common family narrative. The study period for both groups will be 12 months. Follow-up assessments will be conducted after 4 months and 12 months. The primary outcomes are the children’s level of functioning, parental sense of competence and family functioning. Discussion: Given the prevalence of transgenerational transmission of mental illness, a systematic approach to prevention is needed in the mental healthcare setting. This study provides valuable knowledge on the Family Talk Preventive Intervention with a large sample size, inclusion of any parental mental illness and examination of the primary outcomes. Trial

Background: Reviews of camera surveillance systems have demonstrated ambivalent behaviors among people who die by railway suicide. Yet, only few preventive measures have been evaluated. Aims: We aimed to review incidents of suicidal behavior at a Danish railway station, install preventive measures, and monitor subsequent calls to a telephone helpline and reports of suicidal incidences. Method: Suicide incidents at Valby Station during 2012-2018 were reviewed to identify options for preventive measures. Based on these findings, signs encouraging help-seeking and other measures were implemented. Calls to the Danish helpline for suicide prevention and suicidal events at the station were subsequently monitored. Results: The review revealed locations where measures were meaningful and signs, physical barriers, and motion-sensitive lights were installed. Over the following 14 months, no suicide deaths occurred, and the signs were mentioned in 14 calls to the helpline, some of which were made by callers who were evaluated to be at high risk of suicide. Limitations: No direct link between implemented measures and observed outcomes could be established. Conclusion: Installing measures, including signs, at appropriate locations at railway platforms may encourage people in crisis to seek support.

Importance: Prior studies have suggested that transgender individuals may be a high-risk group with respect to suicide attempt and mortality, but large-scale, population-based investigations are lacking. Objective: To examine in a national setting whether transgender individuals have higher rates of suicide attempt and mortality than nontransgender individuals. Design, Setting, and Participants: Nationwide, register-based, retrospective cohort study on all 6657456 Danish-born individuals aged 15 years or older who lived in Denmark between January 1, 1980, and December 31, 2021. Exposure: Transgender identity was determined through national hospital records and administrative records of legal change of gender. Main Outcomes and Measures: Suicide attempts, suicide deaths, nonsuicidal deaths, and deaths by any cause during 1980 through 2021 were identified in national hospitalization and causes of death registers. Adjusted incidence rate ratios (aIRRs) with 95% CIs controlling for calendar period, sex assigned at birth, and age were calculated. Results: The 6657456 study participants (50.0% assigned male sex at birth) were followed up during 171023873 person-years. Overall, 3759 individuals (0.06%; 52.5% assigned male sex at birth) were identified as transgender at a median age of 22 years (IQR, 18-31 years) and followed up during 21404 person-years, during which 92 suicide attempts, 12 suicides, and 245 suicide-unrelated deaths occurred. Standardized suicide attempt rates per 100000 person-years were 498 for transgender vs 71 for nontransgender individuals (aIRR, 7.7; 95% CI, 5.9-10.2). Standardized suicide mortality rates per 100000 person-years were 75 for transgender vs 21 for nontransgender individuals (aIRR, 3.5; 95% CI, 2.0-6.3). Standardized suicide-unrelated mortality rates per 100000 person-years were 2380 for transgender vs 1310 for nontransgender individuals (aIRR, 1.9; 95% CI, 1.6-2.2), and standardized all-cause mortality rates per 100000 person-years

Objective: The aim of this study was to: (1) determine the proportion of callers to a national helpline for suicide prevention who were evaluated to be at risk of suicide; (2) identify characteristics associated with being at risk; (3) determine the level of suicidal ideation among callers, as measured by a clinical scale, and compared to the general population. Method: Data on all calls answered at the Danish helpline for suicide prevention during 2018–2019 were analyzed. These consisted of socio-demographic covariates and items related to suicidality, including the Suicidal Ideation Attribute Scale (SIDAS). Data on SIDAS for the general population derived from a survey. Being at risk of suicide, as evaluated by the counselors, was examined as outcome in adjusted logistic regressions. Results: Among 42,393 answered calls, 24,933 (59%) related to personal concerns. Of these, 47% and 14% of callers, respectively, had suicidal thoughts and concrete suicidal plans, while 53% were evaluated to be at risk. Higher risks were found when issues related to self-harm, mental health problems, eating disorders, incest, physical health problems, substance abuse, or sexual assault were mentioned. In all 37% of callers who were administered the SIDAS scale were evaluated to be at high risk of suicide compared to 1.5% in the general population. Conclusions: A substantial share of callers to a national helpline for suicide prevention were evaluated to be at risk of suicide, also when using a clinical scale. This emphasizes the potential for counselors to prevent suicidal behavior.Highlights More than half of callers reaching out to the helpline were evaluated to be at risk of suicide, and 37% were identified as being at high risk using SIDAS, a clinical scale. Being woman, of younger age, having a history of previous suicide attempt as well as experiencing problems related to self-harm, mental disorders, sexual assault, substance abuse, and physical health problems was associated

Background: Suicidal behaviour runs in families, but the nature of transgenerational concordance needs elucidation. The aim of this study was to examine parent-to-child transmission by investigating whether presence and nature of parental suicidal behaviour was associated with suicidal behaviour in children. Methods: We did a retrospective, nationwide, register-based cohort study in Demark using register data. We included all individuals born after 1953 who were 10 years or older and who were recorded as living in Denmark at some point between Jan 1, 1980, and Dec 31, 2016. Adults listed as living with their child at first registration in the Civil Registration System were considered as parents; later records of different legal parents allowed identification of potential step-parents. Self-reported ethnicity data were not available. Exposure to parental suicide attempt and suicide was identified using information from hospital contacts and causes of death from national registers. The examined outcomes were suicide attempt and death by suicide. We calculated incidence rate ratios (IRRs) and cumulative hazards for children's suicide attempt and suicide, taking into account type of parental suicidal behaviour, child's age of exposure, and sex. Findings: In total, 4 419 642 individuals aged 10–63 years were observed during 1980–2016. Of these individuals, 150 222 (3·4%) were exposed to one or more parents with a suicide attempt, 31 564 (0·7%) to at least one parent who died by suicide, and 12 834 (0·3%) to both events. Individuals exposed to parental suicide attempt had higher rates of suicide attempt (IRR 2·72 [95% CI 2·33–3·17]) than individuals exposed to parental suicide (1·77 [1·50–2·09]) when compared with unexposed individuals. Higher rates of suicide were found for individuals exposed to parental suicide (IRR 3·18 [95% CI 2·84–3·58]) than for those exposed to parental suicide attempt (2·37 [2·19–2·57]). The cumulative hazard of suicide attempt was 0·07 for in

Objective: Parental severe mental illness (SMI) increases the lifetime risk of mental and pediatric disorders in the offspring but little is known about specific disorders during early childhood. The primary aim was to investigate the incidence of mental and pediatric disorders among children 0–6 years old exposed to parental SMI, and secondarily to investigate the distribution of disorders on specific child age. Methods: A nationwide, register-based cohort study of 1,477,185 children born in Denmark between 1994.01.01 and 2016.12.31. Incidence rate ratios were calculated using Poisson regression analysis for any and specific mental and pediatric disorders. Results: IRR for any psychiatric disorder was elevated by a factor 2–5 among SMI offspring. Maternal schizophrenia resulted in the highest IRR = 5.23 (4.80–5.69) of any child psychiatric disorder. The risk of anxiety/OCD and attachment disorder among offspring exposed to parental, and in particular maternal, SMI was markedly raised with IRRs for anxiety/OCD between 7.59 and 17.02 and attachment disorders between 6.26 and 15.40. IRRs of mental disorders were highest at age 0–1 year and declined with age. IRR for any pediatric disorder was also elevated with IRRs between 1.01 and 1.28. Disorders of the digestive system and ill-defined symptoms were associated with the highest IRRs. Maternal (vs. paternal) SMI was associated with higher IRRs. IRRs declined slightly with child age. Conclusion: Children exposed to parental SMI are at increased risk of mental and pediatric disorders during early childhood, particularly anxiety/OCD and attachment disorders. If associations are estimates of a modifiable causal relationship, our results indicate a need for early intervention to promote mental and pediatric health among SMI offspring.

Objective: Little is known about people who have been exposed to a suicide attempt by someone they know. The purpose of this study was to examine how many people have been exposed to a suicide attempt by someone they knew and whether the exposure was associated with general well-being and suicidal ideation. Method: A population-based online survey was conducted during 2019 in Denmark (n = 6,191). The associations between exposures to suicide attempt and general well-being (WHO-5) and suicidal ideation (Suicidal Ideation Attributes Scale) were examined using linear regression analyses. Results: Overall, 24.6% reported having experienced a suicide attempt by someone they knew. Of those, 46.5% had experienced a suicide attempt of a close relation and this group reported having been more affected by the event. Those exposed scored lower on general well-being (b: −3.0; 95% CI: −4.2 to −1.8; p > 0.001) and higher on suicidal ideation (b: 1.6; 95% CI: 1.3 - 1.9; p = 0.001) than those not exposed. Half of the exposed reported not having received sufficient support after the event. Conclusion: Suicide attempt affects a substantial share of the population, and it might be relevant to ensure that support is available for those exposed perceived to be in need of support.

Background The association between suicide attempts (SAs) in parents and children is unclear, and risk indicators for intergenerational transmission remain undocumented. We aimed to assess this association, considering the child's developmental period at the time of parents' attempted suicide, and the parental relation. Methods Using a prospective cohort design, nationwide population data were linked to the Psychiatric Central Register and National Patient Register for all individuals aged 10 years or older living in Denmark between 1980 and 2016. We assessed incidence rate ratios (IRRs) and cumulative hazards for children's first SA. Results In a cohort of 4 419 651 children, 163 056 (3.7%) had experienced a parental SA. An SA was recorded among 6996 (4.3%) of the exposed children as opposed to 70112 (1.6%) in unexposed individuals. Higher rates were noted when a parental SA occurred during early childhood (0 ≤ age < 2) [IRR, 4.7; 95% confidence interval (CI) 4.2-5.4] v. late childhood (6 ≤ age < 13) (IRR, 3.6; 95% CI 3.4-3.8) when compared to those unexposed. Children exposed prior to age 2 had the highest rates of all sub-groups when reaching age 13-17 (IRR, 6.5; 95% CI 6.0-7.1) and 18-25 years (IRR, 6.8; 95% CI 6.2-7.4). Maternal SA (IRR, 3.4; 95% CI 3.2-3.5) was associated with higher rates than paternal (IRR, 2.8; 95% CI 2.7-2.9). Conclusion Parental SA was associated with children's own SA. Exposure during early developmental stages was associated with the highest rates. Early preventive efforts are warranted as is monitoring of suicide risk in the children from age 13.

Purpose Severe mental illness (SMI) may interfere with parental caregiving practices and offspring development. Adhering to preventive well-child visits and maintaining good oral hygiene during early childhood requires parental involvement. Whether these activities are affected by parental SMI is unclear. The purpose of the present study was to determine whether children exposed to parental SMI are at increased risk of non-attendance to preventive well-child visits and vaccinations at age 0-5 years and of child dental caries experience at age 5 years. Furthermore, interactions between maternal psychiatric and sociodemographic variables in relation to an adverse child outcome were assessed. Methods Data were obtained from national Danish health registers. All children born in Denmark between January 1997 and December 2010 were followed from birth until their 6th birthday. Results 679,339 children were included in the study (51% male). Of these, 49,059 children (7.8%) had at least one parent with a lifetime SMI diagnosis. Children of parents with SMI had elevated odds of missing well-child visits and vaccinations (OR 1.41; 95% CI 1.39-1.44,p <0.0001), and of child dental caries (OR 1.58; 95% CI 1.55-1.62,p <0.0001). In the presence of maternal SMI, low socioeconomic classification and single-mother status added more to the elevated risk than specific maternal diagnosis or timing of last psychiatric contact. Conclusion Parents with SMI are less compliant with preventive child healthcare activities than parents without SMI. This indicates a need for practical support to these families in order to prevent inequality in health among their offspring.

Objective: Little is known about people who have been exposed to a suicide attempt by someone they know. The purpose of this study was to examine how many people have been exposed to a suicide attempt by someone they knew and whether the exposure was associated with general well-being and suicidal ideation. Method: A population-based online survey was conducted during 2019 in Denmark (n = 6,191). The associations between exposures to suicide attempt and general well-being (WHO-5) and suicidal ideation (Suicidal Ideation Attributes Scale) were examined using linear regression analyses. Results: Overall, 24.6% reported having experienced a suicide attempt by someone they knew. Of those, 46.5% had experienced a suicide attempt of a close relation and this group reported having been more affected by the event. Those exposed scored lower on general well-being (b: −3.0; 95% CI: −4.2 to −1.8; p > 0.001) and higher on suicidal ideation (b: 1.6; 95% CI: 1.3 – 1.9; p = 0.001) than those not exposed. Half of the exposed reported not having received sufficient support after the event. Conclusion: Suicide attempt affects a substantial share of the population, and it might be relevant to ensure that support is available for those exposed perceived to be in need of support.

Aims: Preventive interventions for children of parents with mental illness are widely recommended. Mental health services entrust concern for patients’ children by referrals to child protection services. We investigated service coverage for children following referrals. Methods: Data from referrals regarding 376 children of adult psychiatry patients over 2008–2012 was linked to information from municipal records and Danish national registers. We conducted Cox regression and used Kaplan–Meier curves to show time to intervention and cumulative incidence of any child and family support services with one-year follow-up from referral date. Results: At follow-up, 32% of children were provided with a child and family support service on average 73.4 days after referral. The most common services were family treatment (18%) and family counseling (11%). A statutory child assessment was conducted for 21% of children. Contents of the referrals suggested that 60% of children experienced adverse home environments and/or acute situations due to parents’ psychiatric illness. Predictors of initiation of support services included a child living alone with the patient, hazard ratio 2.09 (1.41–3.08), the patient being the mother, hazard ratio 1.72 (1.11–2.65), and an adverse home environment presenting an acute situation specified in referral, hazard ratio 1.89 (1.01–3.51). Conclusion: Our finding that only one third of children receive support after referrals from psychiatry within an average of three months suggests an underserved population of at-risk children. These findings warrant reconsideration of resource allocation and creation of more efficient intervention strategies to protect at-risk children and prevent development of mental illness and adversity.

It is well established that children with familial high risk of schizophrenia (FHR-SZ) or bipolar disorder (FHR-BP) have a higher risk of developing mental disorders, however, little is known of to what degree the genetic and environmental vulnerabilities affect the quality of life and self-esteem of these children. We aimed to compare the quality of life and self-esteem between children with FHR-SZ or FHR-BP and controls. We used Danish nationwide registers to retrieve a cohort of 522 7-year-old children with FHR-SZ or FHR-BP and controls. Quality of life was assessed with the 'Health-related Quality of Life Screening Instrument', KIDSCREEN-27, and the scale 'Social Acceptance (Bullying)' from the KIDSCREEN-52. Self-esteem was assessed with the self-report scale 'I think I am'. Assessors were blind to familial risk status of the children. Children with FHR-SZ displayed lower levels of the general quality of life, as well as lower scores on the 'Psychological Well-being' scale and the 'School Environment' scale of the KIDSCREEN-27 compared with controls. Both children with FHR-SZ and FHR-BP reported more bullying victimization compared with controls. Children with FHR-SZ reported lower self-esteem on the total scale of 'I think I am', as well as on the 'Skills and talents', the 'Psychological well-being', and the 'Relationships with others' subscales compared with controls. The findings of lower quality of life and self-esteem in children with FHR-SZ together with more bullying victimization in both familial high-risk groups call for studies on low risk, early intervention strategies towards this group of vulnerable children.

BACKGROUND: The offspring of parents with severe mental illness (SMI) are at higher risk of mortality and of developing certain somatic diseases. However, across the full spectrum of somatic illness, there remains a gap in knowledge regarding morbidity.METHODS: We conducted a register-based nationwide cohort study of all 2 000 694 individuals born in Denmark between 1982 and 2012. Maximum age of offspring at follow-up was 30 years. Information on parents' psychiatric diagnoses of schizophrenia, bipolar disorder, and unipolar depression was retrieved from the Psychiatric Central Register. We estimated incidence rate ratio (IRR), cumulative incidence percentage and mortality rate ratio of first hospital contact for a broad spectrum of somatic illnesses according to the International Statistical Classification of Diseases and Related Health Problems. Analyses were adjusted for important confounders.RESULTS: Offspring of individuals with SMI had higher risk of somatic hospital contacts IRR: 1.17 (95% CI: 1.16-1.18) with maternal depression being associated with the highest IRR (1.22, 95% CI: 1.20-1.24). Offspring of parents with SMI had higher risk within most broad diagnostic categories with highest IRRs for unclassified somatic diagnoses, infections and endocrine diseases ranging from 1.27 (95% CI: 1.25-1.28) to 1.26 (95% CI: 1.23-1.29) (all P < .0001). Morbidity was particularly increased in children aged 0-7 years. The mortality rate ratio associated with parental SMI was 1.31 (95% CI: 1.21-1.41) with excess mortality mainly due to unnatural causes.CONCLUSION: Our findings indicate that offspring of parents with SMI experienced increased mortality and somatic morbidity warranting heightened vigilance and support for this population.

BACKGROUND: Studies have suggested that poor school achievement is associated with increased risk of schizophrenia; however, the possible genetic contribution to this association is unknown. We investigated the possible effect of the polygenic risk score (PRS) for schizophrenia (PRSSCZ) and for educational attainment (PRSEDU) on the association between school performance and later schizophrenia.METHODS: We conducted a case-cohort study on a Danish population-based sample born from 1987 to 1995 comprising 1470 individuals with schizophrenia and 7318 subcohort noncases. Genome-wide data, school performance, and family psychiatric and socioeconomic background information were obtained from national registers and neonatal biobanks. PRSSCZ and PRSEDU were calculated using discovery effect size estimates from a meta-analysis of 34,600 cases and 45,968 controls and 293,723 individuals.RESULTS: Higher PRSSCZ increased the risk (incidence rate ratio [IRR]: 1.28; 95% confidence interval [CI], 1.19-1.36), whereas higher PRSEDU decreased the risk of schizophrenia (IRR, 0.87; 95% CI, 0.82-0.92) per standard deviation. Not completing primary school and receiving low school marks were associated with increased risk of schizophrenia (IRR, 2.92; 95% CI, 2.37-3.60; and IRR, 1.58; 95% CI, 1.27-1.97, respectively), which was not confounded by PRSSCZ or PRSEDU. Adjusting for social factors and parental psychiatric history, effects of not completing primary school and receiving low school marks were attenuated by up to 25% (IRR, 2.19; 95% CI, 1.75-2.73; and IRR, 1.39; 95% CI, 1.11-1.75, respectively). Increasing PRSEDU correlated with better school performance (p < .01; R2 = 7.6%). PRSSCZ and PRSEDU was significantly negatively correlated (r = -.31, p < .01).CONCLUSIONS: The current PRS did not account for the observed association between primary school performance and risk of schizophrenia.

Background: Offspring of parents with severe mental illness (SMI: schizophrenia, bipolar disorder or major depressive disorder) have an increased risk of developing mental disorder themselves. In childhood they may have neurodevelopmental delays, cognitive deficits and social adversities. We aimed to investigate if these individuals are more at risk of being diagnosed with a mental disorder during childhood/adolescence in a national sample. Methods: By linking Danish registers we established a cohort consisting of all persons born to parents with SMI with those born to parents without SMI serving as a reference group. Incidence rate ratios (IRRs) for offspring diagnosed with a mental disorder by parental mental disorder were calculated. Results: Offspring of parents with SMI showed increased IRR for all diagnoses of child and adolescent mental disorders compared to the reference group. Offspring of mothers with schizophrenia had IRR of 2.60 (CI: 2.50-2.70, N = 2550) of having any diagnoses, for children of fathers with schizophrenia IRR was 2.06 (CI: 1.97-2.16, N = 1901) and for offspring of two parents with schizophrenia IRR was 4.57 (CI: 3.94-5.31, N = 175). For individuals with a mother with bipolar disorder the IRR was 2.29 (CI: 2.09-2.50, N = 502), with a father 1.77 (CI: 1.74-1.87, N = 320), whereas the IRR was 2.96 (CI: 2.63-3.34, N = 264) if both parents had unipolar depression. Discussion: Offspring of parents with a SMI have a higher risk of being diagnosed with any child and adolescent mental disorder. The IRRs for all diagnoses during childhood were increased by a factor 2-4. Having two ill parents increased the IRR.

BACKGROUND: Schizophrenia (SZ) and bipolar disorder (BP) are causes of severe disability worldwide and parents' severe mental illness (SMI) is associated with childhood adversity, and socio-emotional and cognitive problems in children. Yet, how parental BP and SZ affect educational attainment in offspring is still unclear.METHOD: We included all children (N = 684.248) born and living in Denmark between 1986 and 1996 and their parents. Our follow-up lasted from 1986 until children's graduation in 2014. The main outcome variable was their school grades following their primary education. School outcomes were divided into four categories: not graduated, low-grade point average (GPA), medium GPA and high GPA. We then performed a multiple logistic regression with medium GPA as the reference category, with the children of parents without SZ or BP as the reference group.RESULTS: Children of parents with SZ faced higher odds than their peers of not graduating primary education (OR 2.6), along with low GPA (odds ratios (OR) 1.6) and lower odds for a high GPA (OR 0.7). Moreover, it was the children of mothers rather than fathers with BP who had higher odds of not graduating primary education (OR 1.6). Lastly, child placement was associated with lower grades and lower graduation rates, and outcomes for children of parents with SMI were favorable compared with other children placed in care.CONCLUSION: For children, parental SZ is associated with lower grades and lower chances for graduating primary education. In contrast, the children of parents with BP were indistinguishable from the reference group regarding school grades. This signifies that specificity of parental severe mental illness is important in relation to educational achievement of children.

OBJECTIVES: Little is known about risk of custody loss or out-of-home placement among children whose mothers experience postpartum mental disorders, and whether this risk differs from that of children whose mothers had earlier onset of their mental disorder.METHODS: National Danish registers comprising 1 868 467 births (1982-2012) were used to determine how the timing of maternal illness onset influences out-of-home placement risk up to age 18 years among children exposed to a maternal mental disorder.RESULTS: Compared to children unexposed to maternal mental illness, risk was higher for children exposed to a maternal mental disorder whose mothers had a first contact for a mental disorder in the 0-12 months of predelivery (8.17/1000 person-years; aIRR 4.56, 95% CI 4.08-5.09), the first 3 months postpartum (4.60/1000 person-years; 3.55, 2.95-4.26) and 4-12 months postpartum (6.49/1000 person-years; 3.93, 3.50-4.41). Risk was even higher for children exposed to a maternal mental disorder when illness onset was more than 1-year predelivery (9.11/1000 person-years; 5.48, 5.32-5.66).CONCLUSION: Risk of out-home placement in children exposed to mothers with a new-onset postpartum mental disorder is almost as high as in children whose mothers have long-standing illness. A better understanding of the trajectories of these mothers and children is warranted.

Objective To provide an overview of living arrangements during childhood for children of parents with schizophrenia, bipolar disorder, and depression. Method Information was obtained from Danish registers on children's addresses and used to calculate the proportion living in different household living arrangements. The study was conducted as a prospective, register-based cohort study covering all children in the entire Danish population born after 1982 (N = 1,823,625) and their parents with a diagnosis of schizophrenia, bipolar disorder, depression, or none of these disorders. Regression analyses were performed assessing the risk of dissolution of the conjugal family. Results Children's living arrangements were characterized by fewer nuclear families and more single-parent–headed households when parents had serious mental illness (SMI). From birth, 15% to 20% of children lived with a single mother with SMI. Conjugal families were dissolved at higher rates if a parent had SMI, especially if the mother (incidence rate ratio 2.98; 95% CI 2.80–3.17) or the father (incidence rate ratio 2.60; 95% CI 2.47–2.74) had schizophrenia. Risks for family dissolution varied greatly with parents’ socioeconomic position in all diagnostic groups. Conclusion Parents’ SMI affects children's family living arrangements because fewer children live with both parents and more children live with a single parent or are separated from both parents. Family cohesion seems especially difficult to maintain when parents have schizophrenia.