Hannah E. Jongsma
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View article: Migrant integration policies, regional social disadvantage, ethnicity and psychosis risk: Findings from the EU-GEI study
Migrant integration policies, regional social disadvantage, ethnicity and psychosis risk: Findings from the EU-GEI study Open
View article: Interplay Between Childhood Maltreatment, Subclinical Post‐Traumatic Stress Symptoms, and <scp>IQ</scp>: Findings From the <scp>EU</scp>‐<scp>GEI</scp> Multicentre Case–Control Study
Interplay Between Childhood Maltreatment, Subclinical Post‐Traumatic Stress Symptoms, and <span>IQ</span>: Findings From the <span>EU</span>‐<span>GEI</span> Multicentre Case–Control Study Open
Introduction Evidence suggests that childhood maltreatment affects cognitive performance in both patients with psychosis and community controls. However, the interplay between childhood maltreatment, post‐traumatic stress symptoms (PTSS), …
View article: Nonverbal correlates of paranoid ideation – a systematic literature review
Nonverbal correlates of paranoid ideation – a systematic literature review Open
Background and Aim Insight in nonverbal correlates of paranoid ideation can potentially help improve diagnostic procedures and guide interventions. The aim was to systematically evaluate the scientific evidence investigating nonverbal corr…
View article: Cognitive presentation at psychosis onset through premorbid deterioration and exposure to environmental risk factors
Cognitive presentation at psychosis onset through premorbid deterioration and exposure to environmental risk factors Open
Background Previous studies identified clusters of first-episode psychosis (FEP) patients based on cognition and premorbid adjustment. This study examined a range of socio-environmental risk factors associated with clusters of FEP, aiming …
View article: Psychological side effects of antipsychotic medication after remission from first-episode psychosis: a HAMLETT ecological momentary assessment study
Psychological side effects of antipsychotic medication after remission from first-episode psychosis: a HAMLETT ecological momentary assessment study Open
Background Evidence on psychological side effects (PSEs) of antipsychotic medication after remission from first-episode psychosis (FEP), and their momentary impact on daily life, is limited. This study examined how Dopamine-2 (D 2 ) affini…
View article: Polygenic and Polyenvironment Interplay in Schizophrenia-Spectrum Disorder and Affective Psychosis; the EUGEI First Episode Study
Polygenic and Polyenvironment Interplay in Schizophrenia-Spectrum Disorder and Affective Psychosis; the EUGEI First Episode Study Open
Background Multiple genetic and environmental risk factors play a role in the development of both schizophrenia-spectrum disorders and affective psychoses. How they act in combination is yet to be clarified. Methods We analyzed 573 first e…
View article: Associations between momentary mental states and concurrent social functioning after remission from first episode psychosis: A HAMLETT ecological momentary assessment study
Associations between momentary mental states and concurrent social functioning after remission from first episode psychosis: A HAMLETT ecological momentary assessment study Open
Self-reported PEs, momentary motivation/drive and general affective symptoms are associated with daily-life functioning after remission from FEP. Retrospective observer-rated and momentary self-report assessment methods do not measure the …
View article: The impact of schizophrenia genetic load and heavy cannabis use on the risk of psychotic disorder in the EU-GEI case-control and UK Biobank studies
The impact of schizophrenia genetic load and heavy cannabis use on the risk of psychotic disorder in the EU-GEI case-control and UK Biobank studies Open
Background The association between cannabis and psychosis is established, but the role of underlying genetics is unclear. We used data from the EU-GEI case-control study and UK Biobank to examine the independent and combined effect of heav…
View article: Variation of subclinical psychosis as a function of population density across different European settings: Findings from the multi‐national <scp>EU</scp> ‐ <scp>GEI</scp> study
Variation of subclinical psychosis as a function of population density across different European settings: Findings from the multi‐national <span>EU</span> ‐ <span>GEI</span> study Open
Background Urbanicity is a well‐established risk factor for psychosis. Our recent multi‐national study found an association between urbanicity and clinical psychosis in Northern Europe but not in Southern Europe. In this study, we hypothes…
View article: Cannabis use and cognitive biases in people with first-episode psychosis and their siblings
Cannabis use and cognitive biases in people with first-episode psychosis and their siblings Open
Background Cannabis use and familial vulnerability to psychosis have been associated with social cognition deficits. This study examined the potential relationship between cannabis use and cognitive biases underlying social cognition and f…
View article: The effect of polygenic risk score and childhood adversity on transdiagnostic symptom dimensions at first-episode psychosis: evidence for an affective pathway to psychosis
The effect of polygenic risk score and childhood adversity on transdiagnostic symptom dimensions at first-episode psychosis: evidence for an affective pathway to psychosis Open
View article: Methylomic signature of current cannabis use in two first-episode psychosis cohorts
Methylomic signature of current cannabis use in two first-episode psychosis cohorts Open
The rising prevalence and legalisation of cannabis worldwide have underscored the need for a comprehensive understanding of its biological impact, particularly on mental health. Epigenetic mechanisms, specifically DNA methylation, have gai…
View article: Age-at-migration, ethnicity and psychosis risk: Findings from the EU-GEI case-control study
Age-at-migration, ethnicity and psychosis risk: Findings from the EU-GEI case-control study Open
Several studies have highlighted increased psychosis risk in migrant and minority ethnic populations. Migration before age 18 appears to increase risk, but further evidence is required. We investigated this issue in a European case-control…
View article: Recruitment issues in a multicenter randomized controlled trial about the effect of the Cultural Formulation Interview on therapeutic working alliance
Recruitment issues in a multicenter randomized controlled trial about the effect of the Cultural Formulation Interview on therapeutic working alliance Open
This short communication concerns recruitment issues in a multicenter randomized controlled trial. An overview of anticipated and unexpected recruitment issues at various organizational levels is discussed as encountered in this trial. The…
View article: The Role of Social Deprivation and Cannabis Use in Explaining Variation in the Incidence of Psychotic Disorders: Findings From the EU-GEI Study
The Role of Social Deprivation and Cannabis Use in Explaining Variation in the Incidence of Psychotic Disorders: Findings From the EU-GEI Study Open
Background and Hypothesis Recent findings suggest the incidence of first-episode psychotic disorders (FEP) varies according to setting-level deprivation and cannabis use, but these factors have not been investigated together. We hypothesiz…
View article: Age-at-migration, ethnicity and psychosis risk: findings from the EU-GEI case-control study
Age-at-migration, ethnicity and psychosis risk: findings from the EU-GEI case-control study Open
Background: Several studies have highlighted increased psychosis risk in migrant and minority ethnic populations. Migration before age 18 appears to increase risk, but further evidence is required. We investigated this issue in a European …
View article: The role of social deprivation and cannabis use in explaining variation in the incidence of psychotic disorders: findings from the EU-GEI study
The role of social deprivation and cannabis use in explaining variation in the incidence of psychotic disorders: findings from the EU-GEI study Open
Background and Hypothesis: Recent findings suggest the incidence of first episode psychotic disorders (FEP) varies according to setting-level deprivation and cannabis use, but these factors have not been investigated together. We hypothesi…
View article: The effect of the cultural formulation interview on therapeutic working alliance: a study protocol
The effect of the cultural formulation interview on therapeutic working alliance: a study protocol Open
Background The Cultural Formulation Interview (CFI) is designed to improve understanding of patients’ mental health care needs. The lack of empirical evidence on the impact and effectiveness of CFI use in clarifying people’s perspectives, …
View article: Variation of subclinical psychosis across 16 sites in Europe and Brazil: findings from the multi-national EU-GEI study
Variation of subclinical psychosis across 16 sites in Europe and Brazil: findings from the multi-national EU-GEI study Open
Background Incidence of first-episode psychosis (FEP) varies substantially across geographic regions. Phenotypes of subclinical psychosis (SP), such as psychotic-like experiences (PLEs) and schizotypy, present several similarities with psy…
View article: Methylomic signature of current cannabis use in two first-episode psychosis cohorts
Methylomic signature of current cannabis use in two first-episode psychosis cohorts Open
The rising prevalence and legalization of cannabis worldwide have underscored the need for a comprehensive understanding of its biological impact, particularly on mental health. Epigenetic mechanisms, specifically DNA methylation, have gai…
View article: Differences in Patterns of Stimulant Use and Their Impact on First-Episode Psychosis Incidence: An Analysis of the EUGEI Study
Differences in Patterns of Stimulant Use and Their Impact on First-Episode Psychosis Incidence: An Analysis of the EUGEI Study Open
Background Use of illegal stimulants is associated with an increased risk of psychotic disorder. However, the impact of stimulant use on odds of first-episode psychosis (FEP) remains unclear. Here, we aimed to describe the patterns of stim…
View article: The relationship between genetic liability, childhood maltreatment, and IQ: findings from the EU-GEI multicentric case–control study
The relationship between genetic liability, childhood maltreatment, and IQ: findings from the EU-GEI multicentric case–control study Open
View article: Cannabis use as a potential mediator between childhood adversity and first-episode psychosis: results from the EU-GEI case–control study
Cannabis use as a potential mediator between childhood adversity and first-episode psychosis: results from the EU-GEI case–control study Open
Background Childhood adversity and cannabis use are considered independent risk factors for psychosis, but whether different patterns of cannabis use may be acting as mediator between adversity and psychotic disorders has not yet been expl…
View article: The association between reasons for first using cannabis, later pattern of use, and risk of first-episode psychosis: the EU-GEI case–control study
The association between reasons for first using cannabis, later pattern of use, and risk of first-episode psychosis: the EU-GEI case–control study Open
Background While cannabis use is a well-established risk factor for psychosis, little is known about any association between reasons for first using cannabis (RFUC) and later patterns of use and risk of psychosis. Methods We used data from…
View article: Exploring the mediation of DNA methylation across the epigenome between childhood adversity and First Episode of Psychosis—findings from the EU-GEI study
Exploring the mediation of DNA methylation across the epigenome between childhood adversity and First Episode of Psychosis—findings from the EU-GEI study Open
View article: Post-migration trajectories and psychopathological vulnerability
Post-migration trajectories and psychopathological vulnerability Open
Background Psychosis rates are higher among some migrant groups. We hypothesized that psychosis in migrants is associated with cumulative social disadvantage during different phases of migration. Methods We used data from the EUropean Netw…
View article: Development and Validation of Predictive Model for a Diagnosis of First Episode Psychosis Using the Multinational EU-GEI Case–control Study and Modern Statistical Learning Methods
Development and Validation of Predictive Model for a Diagnosis of First Episode Psychosis Using the Multinational EU-GEI Case–control Study and Modern Statistical Learning Methods Open
Background and Hypothesis It is argued that availability of diagnostic models will facilitate a more rapid identification of individuals who are at a higher risk of first episode psychosis (FEP). Therefore, we developed, evaluated, and val…
View article: The incidence of non-affective psychotic disorders in low and middle-income countries: a systematic review and meta-analysis
The incidence of non-affective psychotic disorders in low and middle-income countries: a systematic review and meta-analysis Open
View article: Exploring the mediation of DNA methylation across the epigenome between childhood adversity and First Episode of Psychosis – findings from the EU-GEI study
Exploring the mediation of DNA methylation across the epigenome between childhood adversity and First Episode of Psychosis – findings from the EU-GEI study Open
Studies conducted in psychotic disorders have shown that DNA-methylation (DNAm) is sensitive to the impact of Childhood Adversity (CA). However, whether it mediates the association between CA and psychosis is yet to be explored. Epigenome-…
View article: Child maltreatment, migration and risk of first-episode psychosis: results from the multinational EU-GEI study
Child maltreatment, migration and risk of first-episode psychosis: results from the multinational EU-GEI study Open
Background Child maltreatment (CM) and migrant status are independently associated with psychosis. We examined prevalence of CM by migrant status and tested whether migrant status moderated the association between CM and first-episode psyc…