Richard Ernest Tremblay

Richard Ernest Tremblay
University College Dublin | UCD · School of Public Health, Physiotherapy & Population Science

About

899
Publications
193,925
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47,138
Citations
Citations since 2017
200 Research Items
16954 Citations
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201720182019202020212022202305001,0001,5002,0002,5003,000
201720182019202020212022202305001,0001,5002,0002,5003,000
201720182019202020212022202305001,0001,5002,0002,5003,000

Publications

Publications (899)
Article
Background: Research is yet to elucidate adolescent polysubstance use profiles among youth with early-onset cannabis use (CU; ≤15 years). The present study aimed to fill this gap in the literature and determine whether CU outcomes in early adulthood are best explained by early-onset CU per se, or by its resulting polysubstance use profiles. Methods...
Article
Importance: Little is known about the long-term economic and social outcomes for children with longitudinally assessed comorbid externalizing and internalizing symptoms, especially compared with children with externalizing symptoms or internalizing symptoms only. Objective: To examine the association between childhood trajectories of externalizi...
Article
Objectives: The COVID-19 pandemic has been associated with increased mental health problems. We investigated (1) associations between disordered eating in adolescence and mental health problems after one year of the pandemic and (2) the mechanisms explaining associations. Method: We analyzed data from a population-based birth cohort in Quebec, C...
Article
Social wariness and preference for solitude, two dimensions of social withdrawal, show unique associations with various socioemotional difficulties in childhood, including internalizing and peer problems. However, their early childhood predictors remain vastly undocumented. The present study aimed to examine whether early indicators of reactivity i...
Article
Full-text available
The present study documented in two distinct population-based samples the contribution of preschool fluid and crystallized cognitive abilities to school achievement in primary school and examined the mediating role of crystallized abilities in this sequence of predictive associations. In both samples, participants were assessed on the same cognitiv...
Article
Full-text available
Background Eating behaviors may contribute to differences in body weight and diet over time. Our study aims to examine how eating behaviors of young adults relate to their current weight status and dietary patterns and to explore longitudinal associations with eating behaviors in early childhood. Methods Study participants are young adults (n = 69...
Article
This exploratory study investigated patterns of children's relative ranking of academic achievement in the classroom from grade 1 to grade 6 and their association with child, parental and socio-familial characteristics assessed 5 months after birth in a population birth-cohort (92% White of European ancestry, N = 1538, 48.1% boys). Using teacher ra...
Article
Despite the substantial heritability of antisocial behavior (ASB), specific genetic variants robustly associated with the trait have not been identified. The present study by the Broad Antisocial Behavior Consortium (BroadABC) meta-analyzed data from 28 discovery samples (N = 85,359) and five independent replication samples (N = 8058) with genotypi...
Article
Background: Peer victimisation has been associated with depressive symptoms during adolescence, however not all peer victimised adolescents will exhibit such symptoms. This study tested whether having a genetic predisposition to developing depression increased the risk of experiencing depressive symptoms in peer victimised youth. To date, no study...
Article
Full-text available
Despite the substantial heritability of antisocial behavior (ASB), specific genetic variants robustly associated with the trait have not been identified. The present study by the Broad Antisocial Behavior Consortium (BroadABC) meta-analyzed data from 28 discovery samples (N = 85,359) and five independent replication samples (N = 8,058) with genotyp...
Article
Importance: Understanding the longitudinal, bidirectional associations between disturbed sleep and depression in childhood and adolescence is crucial for the development of prevention and intervention programs. Objective: To test for bidirectional associations and cascade processes between disturbed sleep and depressive symptoms covering both ch...
Article
Full-text available
We assessed the psychometric properties of the Social Behavior Questionnaire (SBQ), a 30-item questionnaire evaluating social (e.g., disruptive behaviors, bullying) and emotional problems (e.g., anxiety, depression) among children aged 3.5–12 years. Children ( n = 1,950, 50.21% boys) were drawn from the Quebec Longitudinal Study of Child Developmen...
Article
A childhood intervention to improve the social skills and self-control of at-risk kindergarten boys in the 1980s had positive impacts over the life course: higher trust and self-control as adolescents; increased social group membership, education, and reduced criminality as young adults; and increased marriage and employment as adults. Using admini...
Article
Full-text available
This study investigated the transactional relations between vocabulary and disruptive behaviors (DB; physical aggression and opposition/rule breaking/theft and vandalism), during the transition to formal schooling, using a community sample of 572 children. Cross-lagged panel model analyses were used to examine bidirectional relationships, comparing...
Article
Aims Internalizing symptoms are theorized to lead to substance use (SU) via a tendency to use substances to cope with or self-medicate negative feelings and emotions; however, empirically, this association is mixed, pointing to the existence of moderating factors. The present study aimed to examine how self-, teacher, and father-reported attention-...
Article
Full-text available
Background: Adolescence is a critical period for the development of eating disorders, but data is lacking on the heterogeneity of their evolution during that time-period. Group-based trajectories can be used to understand how eating disorders emerge and evolve over time. The aim of this study was to identify groups of individuals with distinct lev...
Article
Full-text available
This study aims to identify distinct trajectories of cannabis use during adolescence and examine whether Sociability (ability to relate to others) and Responsibility (ability to integrate a community setting) during childhood are associated with these trajectories, accounting for individual and familial confounders. Population-based cohort study (1...
Article
Given the importance of writing for academic achievement, this study aimed to understand how early oral language contributes to later writing skills. The first objective was to determine if preschool language skills were associated with high school writing, and if so, whether they contributed directly or indirectly through school age language. The...
Article
Full-text available
This study investigated adolescents’ single and co-occurring developmental patterns of gambling participation and substance use and their association with gambling and substance use-related issues at age 17, controlling for confounders. Multiple assessments from age 12 to 17 were conducted in a population-based cohort (N=1594, 51.2% boys). Latent g...
Article
Objective: Prospective research is needed to better-understand changes in substance use from before to during the coronavirus disease (COVID-19) pandemic, among emerging adults (18-25 years), a high-risk group for substance use. Method: N = 1,096 (weighted sample N = 1,080; 54% female) participants enrolled in the Québec Longitudinal Study of Ch...
Article
Full-text available
We identified mental health outcomes associated with specific developmental trajectories of psychopathic traits across childhood and tested whether positive relationships with parents and teachers have compensatory or protective effects. Participants were 1401 children (52.82% girls) from the Quebec Longitudinal Study of Child Development with avai...
Article
Full-text available
The comorbidity between physical and mental health conditions is challenging and frequently goes unrecognized in practice. Associations between Attention-Deficit/Hyperactivity Disorder (ADHD) and physical conditions have been reported in youth. However, prior research failed to: (1) address the patterns of associations in early childhood, middle ch...
Article
The present study investigated prenatal and early postnatal risk factors associated with developmental patterns of disruptive behaviors (DBs; e.g., hyperactivity-impulsivity, noncompliance, physical aggression) from ages 1.5 to 5 years in a population birth cohort (N = 2,057; 50.7% boys). Six high-trajectory classes obtained by latent growth modeli...
Preprint
Full-text available
Importance: Individuals who have been sexually abused are at a greater risk for poor health, but associations with economic outcomes in mid-life have been overlooked. Objectives: We investigated associations between child sexual abuse (≤18 years) and economic outcomes at 33-37 years, while considering type of report (official/retrospective) and cha...
Chapter
Antisocial behavior (ASB) is an enduring social and health problem that includes a wide spectrum of distinct behaviors throughout development. However, there is much evidence of associations across behaviors and over time. Developmental models that addressed the causes of ASB appeared 150 years ago and alternately adopted genetic, evolutionist, bio...
Article
Adolescent pain is common and continues into adulthood, leading to negative long-term outcomes including substance-related morbidity: an empirical definition of its construct may inform the early detection of persistent pain trajectories. These secondary analyses of a classical twin study assessed whether: headaches, back pains, abdominal pain, che...
Article
Full-text available
Importance Household food insecurity has been associated with mental health problems in children independently of family income and other confounders. It is unclear whether food insecurity during childhood is also associated with mental health and functioning during adolescence. Objective To evaluate longitudinal trajectories of household food ins...
Preprint
Objectives were to examine whether 1) temperament and cortisol response in situations of unfamiliarity at 19 months predict social wariness and preference for solitude throughout childhood; 2) these predictive associations vary as a function of vagal regulation. Participants were 1199 children from the Quebec Newborn Twin Study, followed from 5 mon...
Article
Objective: Together with family factors, early care and education (ECE) services were shown to improve school readiness in kindergarten. However, it is not clear whether better school readiness at age 6 years translates into higher rates of high school graduation years later. Our objective was therefore to investigate the long-term associations be...
Article
Full-text available
Background Peer victimization is associated with a wide range of mental health problems in youth, yet few studies described its association with mental health comorbidities. Methods To test the association between peer victimization timing and intensity and mental health comorbidities, we used data from 1216 participants drawn from the Quebec Long...
Article
Plusieurs études montrent qu’avoir des amis délinquants peut être nuisible à la réussite scolaire. Or, l’homophilie, le principe selon lequel les individus forment des amitiés avec des pairs qui ont des caractéristiques communes, pourrait expliquer en partie l’affiliation à des pairs délinquants. De surcroît, si cette affiliation provient entre aut...
Preprint
Full-text available
Despite the substantial heritability of antisocial behavior (ASB), specific genetic variants robustly associated with the trait have not been identified. The present study by the Broad Antisocial Behavior Consortium (BroadABC) meta-analyzed data from 25 discovery samples (N=85,359) and five independent replication samples (N = 8,058) with genotypic...
Conference Paper
Affiliation with delinquent peers has been associated with negative outcomes in adolescents’ academic achievement. Homophilia, a process by which individuals create friendships with peers who share similar characteristics, could partly explain the affiliation with delinquent peers. Moreover, the association between academic achievement and affiliat...
Article
Commonly comorbid early onset psychiatric disorders might reflect the varying expression of overlapping risk factors. The mediating processes remain poorly understood, but three factors show some promise: adolescent externalizing traits, early life adversity, and midbrain dopamine autoreceptors. To investigate whether these features acquire greater...
Article
Background Youth who attempt suicide are more at risk for later mental disorders and suicide. However, little is known about their long-term socioeconomic outcomes. Aims We investigated associations between youth suicide attempts and adult economic and social outcomes. Method Participants were drawn from the Quebec Longitudinal Study of Kindergar...
Article
Full-text available
Background Concerns have been raised that the COVID-19 pandemic could increase risk for adverse mental health outcomes, especially in young adults, a vulnerable age group. We investigated changes in depression and anxiety symptoms (overall and severe) from before to during the pandemic, as well as whether these changes are linked to COVID-19-relate...
Article
Full-text available
Use of substances such as cannabis, alcohol, and tobacco, has been associated with increased risk of suicide attempt in several observational studies. However, establishing whether these associations are causal is challenging when using observational designs. To evaluate the potential causal contributions of cannabis use, alcohol use, and tobacco s...
Article
Background While childhood externalizing, internalizing and comorbid problems have been associated with suicidal risk, little is known about their specific associations with suicidal ideation and attempts. We examined associations between childhood externalizing, internalizing and comorbid problems and suicidal ideation (without attempts) and attem...
Article
Full-text available
This study examined developmental patterns of co-occurrent alcohol, marijuana, and other illicit drugs use during adolescence and the associated preadolescent risk factors in a longitudinal sample of 926 boys from low-socioeconomic, urban neighborhoods. Latent growth mixture modeling revealed six developmental patterns: non-/low-alcohol and non-ill...
Article
This study examines the link between behavior in kindergarten and adult-life welfare receipt. Teacher-rated behavioral assessments were obtained for inattention, hyperactivity, aggression–opposition, anxiety, and prosociality when children ( n =2960) were aged 5–6 years and linked to their tax return records from age 18–35 years. We used group-base...
Article
Background: Children who consistently withdraw from social situations face increased risk for later socioemotional difficulties. Twin studies indicate that genetic factors substantially account for the persistence of social withdrawal over time. However, the molecular genetic etiology of chronic courses of social wariness and preference for solitu...
Article
Full-text available
Aims Low birth weight is associated with adult mental health, cognitive, and socioeconomic problems. However, the causal nature of these associations remains difficult to establish due to confounding. We aimed to estimate the contribution of birth weight to adult mental health, cognitive, and socioeconomic outcomes using two-sample Mendelian random...
Article
Full-text available
Substance abuse is a significant public health concern that disproportionately burdens males and low-income communities. This study examined (1) longitudinal profiles of male adolescent poly-substance use and (2) their association with social and economic participation across early adulthood. Drawing on a cohort of males (n = 890) from low-income n...
Article
Background: This study aimed to identify perinatal and early-life factors associated with trajectories of psychopathic traits across childhood. Methods: Participants were 1631 children (51.5% girls) from the Quebec Longitudinal Study of Child Development. A wide range of perinatal and early-life factors were assessed from pregnancy to age 2.5 ye...
Article
Full-text available
Purpose The Quebec Longitudinal Study of Child Development (QLSCD) was designed to examine the long-term associations of preschool physical, cognitive, social, and emotional development with biopsychosocial development across childhood, adolescence, and young adulthood. Methods QLSCD is an ongoing prospective cohort including 2120 singletons born...
Article
Cannabis use is linked to symptoms of depression and anxiety, particularly among sexual minorities. This study examines the relationships between cannabis, and depression and anxiety symptoms at 13, 15, and 17 years using cross-lagged models in a predominantly White (n = 1,430; 92%) subsample of 1,548 participants from the Quebec Longitudinal study...
Preprint
Background Concerns have been raised that the Covid-19 pandemic could increase risk for poor mental health, especially in young adults, a vulnerable age group. We investigated changes in depression and anxiety symptoms (overall and severe) from before to during the pandemic, as well as whether these changes are linked to Covid-19 related stressors...
Article
Full-text available
Introduction Childhood behavioral problems are highly prevalent in school-aged children and are associated with poor long-term outcomes. Yet little is known about their association with patterns of partnering in adulthood. Objectives To (1) describe patterns of partnering from age 18-35 years in a large population-based sample, and (2) examine the...
Article
Full-text available
Introduction Disruptive behaviours underpin the most prevalent and costly psychiatric disorders in youth including ADHD and conduct disorder. Yet the association between childhood behavioural problems and economic and social outcomes in adulthood are rarely examined in a population-based samples where early detection and prevention may be possible....
Article
Childhood adversity and anxiety have been associated with increased risk for internalizing disorders later in life and with a range of brain structural abnormalities. However, few studies have examined the link between harsh parenting practices and brain anatomy, outside of severe maltreatment or psychopathology. Moreover, to our knowledge, there h...
Article
Background: Irritable children are at increased risk of suicidal ideation and suicide attempt, but the underlying environmental mechanisms accounting for these associations are largely unknown. We aimed to investigate the mediating role of peer victimization and harsh parenting in the association between childhood irritability and adolescent suici...
Article
Full-text available
Importance Although longitudinal studies have reported associations between early life factors (ie, in-utero/perinatal/infancy) and long-term suicidal behavior, they have concentrated on 1 or few selected factors, and established associations, but did not investigate if early-life factors predict suicidal behavior. Objective To identify and evalua...
Article
Maternal smoking is associated with increased risk of smoking in the offspring. However, it remains unclear whether this association depends on the timing of exposure to maternal smoking. We investigated the association between prenatal and/or postnatal maternal smoking and offspring smoking during adolescence. Participants (N = 1661) were from the...
Article
Background Low birth weight is associated with adult mental health, cognitive and socioeconomic problems. However, the causal nature of these associations remains difficult to establish owing to confounding. Aims To estimate the contribution of birth weight to adult mental health, cognitive and socioeconomic outcomes using two-sample Mendelian ran...
Article
Full-text available
Objective: Only a minority of drug and alcohol users develops a substance use disorder. Previous studies suggest that this differential vulnerability commonly reflects a developmental trajectory characterized by diverse externalizing behaviors. In this study, we examined the relation between child and adolescent externalizing behaviors and adolesc...
Article
Background Few studies investigated the association between maternal smoking during pregnancy and offspring suicide risk, none considering postnatal smoking exposure. We investigated associations between maternal smoking patterns during the pre- and post-natal periods and adolescent suicidal ideation and attempt. Methods We identified longitudinal...
Article
Background Exposure to early adversity has been associated with long-lasting risks for poor health and functioning. Prior research suggests that the hypothalamic-pituitary-adrenal (HPA) axis, and its main end-product glucocorticoid hormone cortisol, may be at play. This study tested whether an index of cumulative socioeconomic and psychosocial adve...
Article
We examined whether adolescents’ loneliness and social withdrawal mediated the association between maternal depressive symptoms and adolescent suicidality. Secondary analyses on the Québec Longitudinal Study of Child Development data were conducted ( n = 1,623). Each mother completed the Centre for Epidemiologic Studies Depression Scale (at child a...
Article
The present study examined, within a longitudinal family-informed design and across middle childhood, the predictive associations between preference for solitude and social wariness, two forms of social withdrawal, and peer difficulties. Specifically, preference for solitude, rather than social wariness, was expected to predict peer victimization a...
Preprint
Background. Children who consistently withdraw from social situations face increased risk for later socioemotional difficulties. Twin studies indicate that genetic factors account for a substantial share in the persistence of social withdrawal over time. However, the molecular genetic etiology of chronic courses of social wariness and preference fo...
Article
Background Various combinations of childhood conduct problems, callous traits and anxiety may confer increased risk of offending, psychopathic traits and mental disorders. Knowledge of these outcomes in adulthood is limited. Aims To compare adult criminal convictions, psychopathy checklist scores and mental disorders between five groups of men, va...
Thesis
The onset of oral language precedes that of written language. Many studies show that the former develops concurrently with the latter, and that oral language skills contribute to writing skills at various stages of development, from preschool to high school. Indeed, language skills are relatively stable over time and many components of oral languag...
Article
Background Maternal depressive symptoms (MDSs) are negatively associated with children's academic performance, with stronger effects sometimes reported in boys. However, few studies have tested the mechanisms of this association. We examined the mediating role of school engagement and peer victimization in this association and tested for sex differ...
Article
Full-text available
Importance Mental health problems are common during the transition from adolescence to young adulthood. Although perceived social support and mental health problems have been shown to be concurrently associated, longitudinal studies are lacking to document the directionality of this association, especially in emerging adulthood (late teens to late...
Article
Full-text available
The current study examines the relationship between prolonged loneliness, physical health, and sleep among young adolescents (10–13 years; N = 1214; 53% girls). Loneliness was measured at 10, 12 and 13 years of age along with parent-reported health and sleep outcomes. Using growth mixture modelling, 6 distinct trajectories were identified: ‘low inc...
Article
Objective: Traumatic brain injuries (TBIs) are sustained by approximately 17% of males in the general population, many of whom subsequently present mental disorders, cognitive, and physical problems. Little is known about predictors of TBIs and how to prevent them. The present study aimed to determine whether inattention-hyperactivity and/or all ex...
Article
Full-text available
Purpose The objective of this study was to compare children with persistent versus transient preschool language delay on language, academic, and psychosocial outcomes in elementary school. Method Children with persistent language delay (n = 30), transient language delay (n = 29), and no language delay (controls; n = 163) were identified from a pop...
Article
Background Most people will partner at some point during their lives. Yet little is known about the association between childhood behavior and patterns of long‐term romantic partnering in adulthood. Methods In this population‐based cohort study, behavioral ratings were prospectively obtained from teachers when children (n = 2,960) were aged 10–12...
Article
Background: We aimed to identify groups of children presenting distinct perinatal adversity profiles and test the association between profiles and later risk of suicide attempt. Methods: Data were from the Québec Longitudinal Study of Child Development (QLSCD, N = 1623), and the Avon Longitudinal Study of Parents and Children (ALSPAC, N = 5734)....
Article
Parents of preterm children are more likely to adopt non-optimal parenting behaviors than parents of full-term (FT) children. However, there is a lack of studies on parents of children born moderate to late preterm (MLP; 32-36 gestational weeks). In this study, we aimed to examine: (1) the association between MLP birth status and the trajectory of...
Article
Full-text available
Previous research has shown that the prenatal environment, commonly indexed by birth weight (BW), is a predictor of morphological brain development. We previously showed in monozygotic (MZ) twins associations between BW and brain morphology that were independent of genetics. In the present study, we employed a longitudinal MZ twin design to investi...
Article
Restless legs syndrome is a relatively common neurological disorder in adults. In childhood, however, its prevalence and genetic contribution are still largely unknown. The objectives of this study were to assess the prevalence of restless legs syndrome (RLS) during childhood and adolescence in a large population‐based cohort and evaluate the degre...