Ralf Kuja‐Halkola

Recreational screen use and internalizing problems from preadolescence to young adulthood in a longitudinal twin cohort with co-twin comparison

Abstract The mental health impact of increasing recreational screen use among youth has raised substantial concerns, yet questions about causality remain unresolved. Here, leveraging a co-twin control design, we examined associations between screen use and internalizing problems...

Major adverse cardiac events and mortality associated with ADHD and its treatment in adults with type 2 diabetes: a multi-national cohort study

Abstract Background Attention-deficit/hyperactivity disorder (ADHD) has been linked to elevated risk of type 2 diabetes (T2D). However, the impact of ADHD and ADHD medication use on prognosis and health outcomes in T2D remains unclear. This study investigates the associations of...

Lifetime substance use disorder and suicidal behaviour: a population-based familial co-aggregation register study

Abstract Substance use disorders (SUD) are associated with suicidal behaviour, but less is known regarding the extent to which familial factors influence these associations across different types of SUD. We performed a national register study including 4,209,615 individuals born...

Life stage shifts in salivary microbiota determinants: a cross-sectional study in twins

Abstract Both host genetics and environmental exposures shape the salivary microbiota; however, the relative contributions of these factors from early life to adulthood remain unclear. To address this, we profiled the salivary microbiota of 3387 twin pairs: 939 infant pairs (9–12...

Characteristics of Monozygotic Twins Discordant for Anorexia Nervosa: Comprehensive Risk Evaluation for Anorexia Nervosa in Twins (CREAT) Study

ABSTRACT Objective To characterise the clinical and phenotypic profile of the Comprehensive Risk Evaluation for Anorexia nervosa in Twins (CREAT) cohort, identify candidate risk and illness‐related correlates of AN, and establish a foundation for forthcoming biological, neuroimag...

Familial Co‐Aggregation of Neurodevelopmental Conditions and Childhood‐Onset Type 1 Diabetes

ABSTRACT Aim Childhood‐onset Type 1 diabetes (T1D) is associated with neurodevelopmental conditions (NDCs). We examined whether this association extends to relatives and assessed phenotypic, genetic, and environmental correlations between T1D and NDCs. Methods Using Swedish regis...