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  • Koen Luyckx
Koen Luyckx

Koen Luyckx
KU Leuven | ku leuven · Research unit for School Psychology and Child and Adolescent Development

Ph.D.

About

380
Publications
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14,497
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Publications

Publications (380)
Article
Background Neuromuscular disorders (NMD) are intrusive medical conditions with implications for psychosocial development. Objectives This paper explores illness perceptions and illness identity dimensions of youth with NMD. First, we compare illness identity outcomes and illness perceptions of NMD patients with a comparison group of adolescents wi...
Article
The transition out of university education and into the workforce represents a turning point in terms of the evolution of one's goals, roles, responsibilities, relationships, and lifestyle. For this reason, this transition might create important challenges and opportunities for identity formation. The present mixed-method longitudinal study examine...
Article
Full-text available
The process of exploring and committing to one's identity for the sake of a future-oriented goal is important for young adults' psychosocial functioning. Whereas the relationship between identity process and psychosocial functioning has been examined in long-term longitudinal studies, the short-term relationship between the two at the daily level h...
Article
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Background and aims Although life expectancy in adults with congenital heart diseases (CHD) has increased dramatically over the past five decades, still a substantial number of patients dies prematurely. To gain understanding in the trajectories of dying in adults with CHD, the last year of life warrants further investigation. Therefore, our study...
Article
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We examined support for type 1 diabetes in casual versus committed romantic relationships and links to blood glucose, self-care, and affect in 101 young adults (Mage 18.8). Individuals provided survey and daily measures of support and blood glucose and affect during a 14-day diary period. Survey data indicated individuals viewed partners as helpful...
Article
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The congenital heart disease (CHD) population now comprises an increasing number of older persons in their 6th decade of life and beyond. We cross-sectionally evaluated patient-reported outcomes (PROs) in persons with CHD aged 60 years or older, and contrasted these with PROs of younger patients aged 40–59 years and 18–39 years. Adjusted for demogr...
Article
Funding Acknowledgements Type of funding sources: Foundation. Main funding source(s): Research Foundation Flanders (to PM, EG, and LVB) European Society of Cardiology (Nursing Training Grant to LVB) Background Heart failure (HF) is a common cause of morbidity and mortality in patients with congenital heart disease (CHD). Although limited in scope,...
Article
Full-text available
In Section III of the Diagnostic and Statistical Manual of Mental Disorders – fifth edition (DSM-5), an Alternative Model for Personality Disorders (AMPD) is proposed, including a criterion for personality functioning impairment (Criterion A) to assess severity of personality pathology. The present study examined the structure, reliability, and con...
Article
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Background: In recent years, patient-reported outcomes (PROs) have received increasing prominence in cardiovascular research and clinical care. An understanding of the variability and global experience of PROs in adults with congenital heart disease (CHD), however, is still lacking. Moreover, information on epidemiological characteristics and the...
Article
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Aims: The coronavirus disease-2019 (COVID-19) pandemic poses significant challenges to many groups within societies, and especially for people with chronic health conditions. It is, however, unknown whether and how the pandemic has thus far affected the physical and mental health of patient populations. Therefore, we investigated how the pandemic...
Article
Objective The interplay and longitudinal associations between positive and negative illness-related experiences in childhood cancer survivors and their families remain unclear. Therefore, benefit finding, cancer-related worries, depressive symptoms, and life satisfaction were prospectively investigated in childhood cancer survivors and parents. Dir...
Article
Aims Absence from work or school in patients with congenital heart disease (CHD) is an understudied domain. Illness identity, which is the degree to which a chronic illness is integrated into one’s identity, could be hypothesized to be a predictor for absenteeism. This study determined the proportion of young adults with CHD absent from work or sch...
Article
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The relationship between smoking and illness perceptions among congenital heart disease (CHD) survivors is unknown. The primary aims of the present study were to compare the smoking prevalence among CHD survivors to a nationally representative U.S. sample and examine the relationship between smoking and illness perceptions. CHD survivors (N = 744)...
Article
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Aims The aims of this study were to investigate the development of illness identity, the degree to which the disease is integrated into one's identity, by identifying trajectory classes in adults with congenital heart disease (CHD) and to describe these classes in terms of age, sex, disease complexity, patient-reported outcomes (PROs) and healthcar...
Article
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In the present study, we investigated the relationship between friendship quality (dimensions) and non-suicidal self-injury (NSSI) as well as the moderating role of gender and age in this relationship. The sample consisted of 463 children and adolescents (50.10% female, age range: 9-17 years). Friendship quality and NSSI were measured using the Fri...
Presentation
Objectives. Individuals develop a narrative identity through constructing and internalizing an evolving life story composed of significant autobiographical memories. The ability to narrate these memories in a coherent manner has been related to psychological well-being, identity functioning, and personality pathology. Previous studies have particul...
Article
Introduction This study investigated the link between trauma and self-harming behaviors in South African high school students, and examined the mediating role of identity formation. Traumatic experiences have been commonly associated with self-harming behaviors in adolescents. However, research addressing this association in non-Western countries i...
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Full-text available
Although it has been postulated that eating disorders (EDs) and obesity form part of a broad spectrum of eating- and weight-related disorders, this has not yet been tested empirically. In the present study, we investigated interindividual differences in sensitivity to punishment, sensitivity to reward, and effortful control along the ED/obesity spe...
Conference Paper
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Funding Acknowledgements Type of funding sources: Public grant(s) – National budget only. Main funding source(s): This work was supported by Research Foundation Flanders [grant numbers G097516N to PM, 12E9816N to EG and 1154719N to LVB]; the King Baudouin Foundation (Fund Joseph Oscar Waldmann-Berteau & Fund Walckiers Van Dessel); the National Foun...
Article
Objective Identity formation was investigated in adolescent and emerging adult cancer survivors from a (neo-)Eriksonian perspective by comparing survivors to control participants. In survivors, associations between identity and clinical/demographical variables and general and illness-specific functioning were investigated. Design Childhood cancer...
Article
Background Patients with adult congenital heart disease (ACHD) have many risk factors for chronic pain such as prior cardiac interventions and adult comorbidities. However, the prevalence of chronic pain has not been well described in this population. We sought to determine the prevalence of pain in a large international cohort of patients with ACH...
Article
The detrimental impact of sociocultural pressures on adolescents’ body image has been widely established. However, it remains unclear why or for whom such pressures lead to increased appearance ideals internalization and appearance comparison. This cross-sectional study investigated moderating and indirect effects of identity confusion/synthesis in...
Presentation
Identity difficulties have been associated with various psychiatric conditions and are considered a central issue in personality pathology. Following the Alternative Model for Personality Disorders forwarded in Section III of DSM-5, measures of self- and interpersonal functioning have been developed. Although these measures were intended to be sepa...
Article
Full-text available
Youth with type 1 diabetes (T1D) must adhere to a complex treatment regimen to prevent health complications. Friends may provide diabetes-specific support to help youth manage diabetes, but evidence on whether youth benefit from diabetes-specific friend support is inconclusive. The present study first investigated whether satisfaction with friend s...
Article
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Introduction: Adolescence is the most critical life period for the development of eating disorder (ED) symptomatology. Although problems in identity functioning and emotion dysregulation have been proven important risk and maintaining factors of ED symptomatology, they have never been integrated in a longitudinal study. Methods: The present study i...
Article
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Although relationships between co-rumination and depressive symptoms have often been found, little research attention has been given to mechanisms underlying this association. The current study investigated brooding rumination as a mediator of the relationship between co-rumination and depressive symptoms. Analyses were performed on data of 1549 ad...
Article
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Objectives: Prior research has linked illness identity-or the extent to which the illness is integrated into one's identity-to diabetes-specific functioning. Four illness identity dimensions have been identified: rejection, acceptance, engulfment, and enrichment. As longitudinal research on this topic is scarce, this study examined developmental t...
Article
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Background and Aims In the present study, we investigated differences in obsessive–compulsive (OC) symptoms in patients with an eating disorder (ED) with or without recent/lifetime impulsive non‐suicidal self‐injury (NSSI). We included 429 female inpatients with an ED, of whom 31.9% engaged in recent impulsive NSSI and 56.4% in lifetime impulsive N...
Poster
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In 2013, DSM-5 urged for further research on non-suicidal self-injury (NSSI) and defined NSSI disorder (NSSI-D) for the first time separate from borderline personality disorder (BPD). However, research on the comorbidity between NSSI-D and BPD symptoms is still scarce, especially in adolescent populations. The current study selected 347 adolescents...
Article
Full-text available
Section III of the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) includes an alternative model for diagnosing personality disorders (PDs). This model highlights identity impairment as a potential criterion of all PDs, which has stimulated researchers to characterize identity functioning across PD presentations....
Article
Full-text available
Objective To derive cluster analysis-based groupings for adults with congenital heart disease (ACHD) when it comes to perceived health, psychological functioning, health behaviours and quality of life (QoL). Methods This study was part of a larger worldwide multicentre study called APPROACH-IS; a cross sectional study which recruited 4028 patients...
Article
Full-text available
Individuals develop a narrative identity through constructing and internalizing an evolving life story composed of significant autobiographical memories. The ability to narrate these memories in a coherent manner has been related to well-being, identity functioning, and personality pathology. Previous studies have particularly focused on coherence...
Article
Full-text available
Patient-reported outcomes (PROs) are “any outcome based on data provided by patients or patient proxy as opposed to data provided from other sources”. Together with clinician-reported, physiological, and caregiver-reported outcomes, PROs are important sources of data to assess health and well-being. Examples of PROs include quality of life, psychos...
Article
Full-text available
Introduction: Research on identity development has primarily studied over-time trends in identity status change and exploration and commitment processes among late adolescents and emerging adults. Identity development in early and mid-adolescents has generally been overlooked. Hence, little is known about how a sense of identity synthesis and confu...
Article
Full-text available
In this international study, we (i) compared patient-reported outcomes (PROs) in adults with congenital heart disease (CHD) who had vs. had not been hospitalized during the previous 12 month, (ii) contrasted PROs in patients who had been hospitalized for cardiac surgery vs. non-surgical reasons, (iii) assessed the magnitude of differences between t...
Article
Full-text available
Individual differences in identity development are commonly captured by identity statuses, representing combinations of high and/or low scores on identity exploration and commitment processes. Although identity impairment is considered a potential diagnostic criterion of all personality disorders (PDs) in Section III of DSM-5, studies that relate i...
Article
Full-text available
The present study investigated the (co-)occurrence of non-suicidal self-injury (NSSI) and pathological buying (PB) and their associations with reactive/regulative temperament in a sample of female patients with eating disorders (ED) and in a sample of community adults. Our samples consisted of 254 community adults (48.8% female) and 60 female patie...
Article
Developmental regulation strategies and identity processes are hypothesized as influencing one another over time. This three‐wave longitudinal study (N=369; 20% male) examined, for the first time, the extent to which (a) identity exploration and commitment processes and (b) developmental regulation strategies (goal engagement and disengagement) pre...
Article
OBJECTIVE Externalizing behavior (i.e., conduct problems, hyperactivity) and executive function (EF) problems in children and adolescents with type 1 diabetes (T1D) have been associated with worse diabetes‐related and psychosocial outcomes but have not been examined in relationship to each other. We aimed to examine whether externalizing behavior i...
Article
Full-text available
In the present study, we examined the relationships between adult identity, strength of identity commitments, and their potential determinants: number of adult social roles undertaken and psychosocial maturity. A total of 358 emerging adults aged 18 to 30 participated. Structural equation modelling analyses indicated that psychosocial maturity dime...
Article
Full-text available
In 2013, DSM-5 urged for further research on non-suicidal self-injury (NSSI) and defined NSSI disorder (NSSI-D) for the first time separate from borderline personality disorder (BPD). However, research on the comorbidity between NSSI-D and BPD symptoms is still scarce, especially in adolescent populations. The current study selected 347 adolescents...
Poster
Full-text available
Eating disorder (ED) patients show alarmingly high prevalence rates of Non-Suicidal Self-Injury (NSSI). Adolescents seem to be particularly at risk, as EDs and NSSI both have their onset in mid-adolescence. It has been suggested that personality could be a transdiagnostic mechanism underlying both EDs and NSSI. However, little attention has been gi...
Article
In the DSM-5 Section III Alternative Model for Personality Disorders (AMPD), the severity of personality pathology (criterion A) and the presence of pathological personality trait domains and facets (criterion B) are assessed independently. Recent studies have challenged this assumption of independence but the interplay between criterion A and crit...
Poster
Full-text available
Vrouwelijke patiënten met een eetstoornis (ES) rapporteren een van de hoogste prevalentiecijfers van nietsuïcidaal zelfverwondend gedrag (ZVG). Temperament en karakter zou als transdiagnostisch mechanisme deze sterke comorbiditeit kunnen verklaren, maar onderzoek focuste voornamelijk op niet-klinische en/of volwassen steekproeven. Toch is de adoles...
Article
Full-text available
True causality is impossible to capture with observational studies. Nevertheless, within the boundaries of observational studies, researchers can follow three steps to answer causal questions in the most optimal way possible. Researchers must: (a) repeatedly assess the same constructs over time in a specific sample; (b) consider the temporal sequen...
Article
Full-text available
Identity difficulties have been associated with various psychiatric conditions and are considered a central issue in personality pathology. Following the Alternative Model for Personality Disorders, measures of self- and interpersonal functioning have been developed. Although these measures were intended to be separate ratings of self-other deficit...
Article
Full-text available
Objective: Eating disorder symptomatology generally develops during adolescence and emerging adulthood. Previous research has focused on the role of identity formation or body image in the development of eating disorder symptomatology, but integrative work is lacking. For this reason, the present cross-sectional study examined the mediating role o...
Article
Background: Atrial arrhythmias, i.e., intra-atrial reentrant tachycardia and atrial fibrillation, are a leading cause of morbidity and hospitalizations in adults with congenital heart disease (CHD). Little is known about their effect on quality of life and other patient-reported outcomes (PROs) in adults with CHD. Objective: To assess the impact...
Article
The aim of the present study was to compare different features of Non-Suicidal Self-Injury (NSSI) in India and Belgium. We also explored whether the strength of the association between NSSI and disturbances in identity formation—a risk factor that can increase vulnerability to NSSI—was similar in young adults from India and Belgium. Data regarding...
Article
Background Nonsuicidal self-injury (NSSI) is being increasingly identified as an important emerging mental health issue in the West. Yet, NSSI has not been adequately studied in clinical and nonclinical contexts in countries like India. Aim The aim of this study was to compare different features of NSSI between clinical and nonclinical samples in...
Article
Full-text available
Background Previous studies have found that sense of coherence (SOC) is positively related to quality of life (QoL) in persons with chronic conditions. In congenital heart disease (CHD), the evidence is scant. Aims We investigated (i) intercountry variation in SOC in a large international sample of adults with CHD; (ii) the relationship between de...
Article
Full-text available
Background: The relationship between healthcare system inputs (e.g., human resources and infrastructure) and mortality has been extensively studied. However, the association between healthcare system inputs and patient-reported outcomes remains unclear. Hence, we explored the predictive value of human resources and infrastructures of the countries...
Article
Full-text available
Introduction This study examined how maternal and paternal stress, anxiety, and trait mindfulness, and child glycemic control are related to real-life parent–child interactions in families confronted with type 1 diabetes (T1D). Methods Parents reported on trait mindfulness, illness-related parenting stress, general stress, and state anxiety. Parent...
Article
Aim: EF (ability to initiate, plan, monitor behavior) impacts self-care and glycemic control in teens with T1D. We examined demographics, insulin therapy, A1c, and EF in 3 international cohorts of teens with T1D. Methods: Parents of 337 teens (13-18) with T1D from Belgium (BE), Netherlands (NL), and U.S. completed the BRIEF to assess teen EF. Paren...
Article
Background Despite clear evidence that peers are crucial for youth development, research on the role of peers for youth with Type 1 diabetes (T1D) is scarce. Purpose The present study identified trajectory classes of perceived peer functioning in youth with T1D, based on peer support and extreme peer orientation (EPO). Further, classes were compar...
Article
Full-text available
Eating disorder (ED) patients show alarmingly high prevalence rates of Non-Suicidal Self-Injury (NSSI). Adolescents seem to be particularly at risk, as EDs and NSSI both have their onset in mid-adolescence. It has been suggested that personality could be a transdiagnostic mechanism underlying both EDs and NSSI. However, little attention has been gi...
Article
Full-text available
Background We compared physical functioning, mental health and quality of life (QoL) of patients with different subtypes of congenital heart diseases (CHD) in a large international sample, and investigated the role of functional class in explaining the variance in outcomes across heart defects. Methods In the cross-sectional APPROACH-IS study, we...
Article
Abatract AIMS Although research exists on parental communication in adolescents with type 1 diabetes (T1D), the role of communication by health care providers remains understudied. Grounded in Self-Determination Theory, this study examined the role of autonomy-supportive communication (i.e., providing meaningful rationale and offering choices with...
Article
Objective Type 1 diabetes in youth has a wide‐ranging impact on families. This study aimed at a better understanding of experiences and difficulties that parents may encounter in their lives. Parental illness intrusiveness (i.e., a parent's perception that the illness of one's child interferes with one's personal life) was prospectively examined in...
Article
Full-text available
As the Inventory of Dimensions of Emerging Adulthood (IDEA) was developed to assess features of emerging adulthood, international differences have been observed between emerging adults over the world. To assess the IDEA's applicability to emerging adults in Flanders, a Dutch translation was administered to 489 participants between 17 and 26 years o...
Article
Full-text available
Eating disorder symptomatology is highly prevalent in adolescence and is regarded one of the most important precursors of clinical eating disorders. The present longitudinal study examined the development of eating disorder symptomatology in adolescents over two years. At Time 1,528 high school students filled out self-report questionnaires (50.5%...