Childhood Life Events Research Articles

Adverse Childhood Experiences and Socioemotional Outcomes of Children Born Very Preterm

ObjectiveTo examine whether adverse childhood experiences (ACEs) confer risk for socio-emotional problems in children born very preterm (VPT) Study designAs part of a longitudinal study, 96 infants born VPT at 23-30 weeks of gestation were recruited from a level III neonatal intensive care unit and underwent follow-up at ages 2 and 5 years. Eighty-three full-term (FT, 37-41 weeks gestation) children were recruited from an adjoining obstetric service and the local community. ACEs were assessed with the Child Life Events Scale at age 2 and Preschool Age Psychiatric Assessment at age 5. At age 5, internalizing, externalizing, and Attention-Deficit/Hyperactivity Disorder (ADHD) symptoms were assessed with the Child Behavior Checklist and Conner’s Rating Scale-Revised, respectively. Covariates including socioeconomic disadvantage, maternal distress, and parent ADHD symptoms were assessed at the 2- and/or 5-year follow-up. Mediation and moderation analysis, accounting for family clustering, examined associations between birth group, ACEs, and socio-emotional outcomes. ResultsAfter covariate adjustment, children born VPT experienced more ACEs (p<0.001), particularly medical ACEs (p<0.01), and had worse ADHD and internalizing outcomes (p<.05) than FT children. ACEs mediated the association between birth group and ADHD outcomes (95% CIs: 0.11 – 4.08). There was no evidence of mediation for internalizing outcomes. Higher parent ADHD symptoms (p<.001) and maternal distress (p<.05) were associated with poorer internalizing outcomes. ConclusionsScreening for childhood ACEs should be embedded in the follow-up care of children born VPT and their families. Strategies to screen for and address parent psychosocial functioning may be important to support children’s socio-emotional development.

Childhood adversity, stress reactivity, and structural brain measures in stress-related/neurodevelopmental disorders, and their comorbidity: A large transdiagnostic cross-sectional study.

Childhood adversity (CA), including childhood adverse life events, increases the risk for development of psychiatric disorders later in life. Both CA and psychiatric disorders are associated with structural brain changes and dysfunctional hypothalamic-pituitary-adrenal-axis. However, many studies investigated single diagnostic and single regions of interest of the brain, and did not take stress reactivity into account. We investigated associations of CA and cortisol levels with gray matter volume and cortical thickness, in a whole-brain manner. Primary analysis constituted of a transdiagnostic approach, followed by a moderation analysis to investigate the influence of diagnosis. Patients with stress-related and/or neurodevelopmental disorders and matched healthy controls underwent an magnetic resonance imaging scan, next to assessing hair cortisol levels and CA/life events. CA was reported by 62-72% of the patients versus 33% of the controls. Primary transdiagnostic linear regression analyses revealed that CA was not associated with gray matter volume, while childhood life events were associated with lower right thalamic volume. Hair cortisol was not associated with any lobe volume. None of the associations were moderated by diagnosis. In conclusion, CA is a risk factor that needs to be taken into account when investigating psychiatric disorders. Yet the relationship with structural brain changes and stress reactivity is less clear than postulated on the basis of more seed-based studies.

A Discrepancy in the Reports on Life Events Between Parents and Their Depressed Children Is Associated with Lower Responsiveness to SSRI Treatment.

Introduction: Exposure to a range of stressful life events (SLE) is implicated in youth psychopathology. Previous studies point to a discrepancy between parents'/children's reports regarding stressful life events. No study systematically assessed the correlation between such discrepancies and psychopathology in depressed youth. This study was designed to assess parent-youth discrepancies regarding stressful life events and its association with severity of psychopathology at baseline and response to selective serotonin reuptake inhibitor (SSRI) treatment in depressed youth. Methods: Reports regarding stressful life events were assessed in children/adolescents suffering from depressive/anxiety disorders using the life events checklist (LEC), a self-report questionnaire measuring the impact of negative life events (NLE) and positive life events (PLE), as reported by the children and their parents. The severity of depression/anxiety disorders and response to antidepressant treatment were evaluated and correlated with both measures of LEC. Results: Participants were 96 parent-child dyads (39 boys, 57 girls) aged 6-18 years (mean = 13.90 years, SD = 2.41). Parents reported more NLE and higher severity of NLE events than their children (number of NLE: 7.51 ± 4.17 vs. 6.04 ± 5.32; Cumulative severity of NLE: 24.95 ± 14.83 vs. 17.24 ± 12.94). Discrepancy in PLE, but not NLE, was associated with more severe psychopathology and reduced response to treatment. Discussion: Discrepancy in informant reports regarding life events in depressed/anxious youth, especially regarding PLE, is associated with more severe psychopathology and reduced response to pharmacotherapy. It is essential to use multiple reporters in assessing stressful life events in children.

Associations Between Cortical Thickness and Adverse Life Events in Children and Adolescents With Psychosis-Spectrum Symptoms

Associations Between Cortical Thickness and Adverse Life Events in Children and Adolescents With Psychosis-Spectrum Symptoms

Stressful life events and the occurrence of skin cancer.

It is widely acknowledged that emotional states can influence skin conditions, yet limited research has delved into the impact of stress on skin cancer development. This retrospective study sought to expand the perspective on skin cancer risk factors by investigating the complex relationship between stressful life events and the incidence of skin cancer. The sample included 268 individuals followed-up in a dermatological clinic, in three groups: Patients who had previously been diagnosed with cutaneous melanoma and are currently in remission (32%), those who had been diagnosed with non-melanoma skin cancer (30%), and a control group who are at risk for skin cancer (38%). Participants filled in questionnaires regarding childhood and adulthood life events, and loss and gain of resources following their subjectively most stressful event in adulthood. Multinomial logistic regression was used to examine the associations of life events with skin cancer occurrence, and mediating and moderating effects of resource loss/gain. Adverse childhood experiences were associated with melanoma occurrence, with the melanoma group reporting significantly more such experiences compared to the control group (p<0.001). Resource loss from subjectively significant stressful life events in adulthood partially mediated the association between adverse childhood experiences and melanoma incidence. The findings suggest that there may be intricate connections between stress, life events, adaptation to change, and skin cancer, which future research may further unravel. This study underscores the need for a more comprehensive approach to stress management, coping strategies development, and skin cancer prevention in healthcare settings.

Paternal use of selective serotonin reuptake inhibitors and adverse health outcomes: A nationwide cohort study on 13,547 exposed children.

The use of selective serotonin reuptake inhibitors (SSRIs) has increased over time. Several studies indicate that paternal use of medication may adversely affect the developing fetus. Only a few studies have investigated the association between preconceptional paternal exposure to SSRIs and the risks of adverse health outcomes in children. This study aimed to assess adverse birth outcomes and adverse early life events in children fathered by men using SSRIs prior to conception. All live-born singleton children born in Denmark from 1997 until 2019 and their parents were included. The exposed cohort comprised all children fathered by men using SSRIs 3 months prior to conception and the unexposed cohort comprised all other children. We estimated the odds ratios for adverse birth outcomes: small for gestational age (SGA), preterm birth, low Apgar score, and major congenital malformations. Furthermore, we estimated the hazard ratios for adverse early life events of infections and hospitalizations within 1 year from birth. We also examined adverse birth outcomes and the adverse early life events according to SSRI subgroups. There was a statistically significantly increased odds ratio 1.15 (confidence interval, CI: 1.06-1.23) for preterm birth. No significant results were found for SGA, low Apgar score, and major congenital malformations. The adjusted hazard ratios for hospitalizations and infections were 1.06 (CI: 1.02-1.11) and 1.02 (CI: 0.97-1.07), respectively. There was a statistically significantly increased odds ratio for preterm birth with respect to the SSRI subgroups citalopram and escitalopram, and for hospitalizations with respect to citalopram. Although the risks of certain adverse birth and adverse early life outcomes were statistically significantly increased, the ratios were small and may have limited clinical importance. Paternal use of SSRI was in general safe in the preconceptual period.

Relationships between psychotic and affective symptoms, schizotypal and dissociative phenomena, and adverse life events among individuals with psychotic disorders

Background: Psychotic symptoms and self-rated schizotypal phenomena have similar dimensional structures. Additionally, dissociative phenomena have conceptual links with psychosis/schizotypy and all of these phenotypes are associated with adverse life events (ALEs). The relationships between these factors among individuals with psychotic disorders are not well established and were investigated in this study. Method: 76 participants with any psychotic disorder were recruited from mental health services in West Yorkshire, UK. Lifetime psychotic and affective symptoms were assessed by research interviews and case record review. The self-rated Schizotypal Personality Questionnaire (SPQ) with additional questions regarding inappropriate affect, Dissociative Experiences Scale (DES), and questionnaires regarding cumulative adverse life events in childhood (CLEQ) and in the year before clinical onset (BLEQ) were also administered. Relationships between factors were assessed using Spearman correlations and linear regression analysis. Results: Correlations with relevant psychotic symptoms ranged from ~0.3 for some positive and negative SPQ subdomains to ~0 for disorganised subdomains. In contrast, SPQ and DES were highly correlated (~0.7). In univariate analysis, ALEs were associated with depression, DES, and positive and disorganised SPQ subdomains. In multivariable analysis, ALEs in childhood and before onset were independently associated with the SPQ Unusual perceptual experiences subdomain. Conclusion: Among individuals with psychotic disorders, neither SPQ nor DES questionnaire responses are likely to be useful proxies for psychotic symptoms. However, particularly questionnaire-based unusual perceptual experiences may be useful when assessing the range of phenomena associated with adverse life events.

Relationship between childhood stressful events and drug consumption among university students

IntroductionThe purpose of this study is to investigate the potential relationship between stressful events experienced in childhood and subsequent toxic substance consumption among university students majoring in Social Education at a Spanish university during the academic year 2022-2023.ObjectivesThe primary objective is to analyze whether an association exists between stressful life events in childhood and patterns of substance consumption among university students.MethodsA cross-sectional, observational, and analytical design was employed. The target population encompassed 258 students enrolled in the Social Education program in 2023. The final sample consisted of 161 students. A questionnaire incorporating the Childhood Trauma Questionnaire - Short Form (CTQ-SF) and the Severity of Dependence Scale (SDS) was administered to assess trauma history and substance consumption.Results A high percentage (95.03%) of students reported having consumed toxic substances at some point in their lives. The most common substances were alcohol (95.03%) and cannabis (52.8%). A statistically significant correlation was observed between childhood emotional abuse and increased alcohol consumption currently (p = 0.015). Furthermore, a significant relationship was identified between childhood sexual abuse and heightened alcohol consumption (p = 0.015). Moreover, positive correlations were found between sexual abuse and the consumption of specific drugs, such as cocaine and psychopharmaceuticals (p &lt; 0.05).No statistically significant differences were observed in drug consumption with regard to other forms of childhood maltreatment, such as emotional or physical neglect.Conclusions The results underscore the connection between childhood stress experiences and substance consumption among university students. Emotional and sexual abuse in childhood are linked to higher alcohol consumption and, in some cases, specific drugs like cocaine and psychopharmaceuticals. These findings emphasize the importance of considering traumatic experiences when addressing prevention and treatment strategies for substance consumption among young student populations.Disclosure of InterestNone Declared

Emotional configurations of grief: Narratives from childhood

Being human involves encountering losses to which grief is a common response. No one can escape grief—it is the price of affection and love. In this paper, we aim to understand how grieving unfolds as described in university students’ short narratives of their childhood. Applying a cultural-historical approach, especially the notion of emotional configuration, we explore the interplay of emotion, sense-making, and practice in grief-related childhood life events. Our research problematizes the binary classification of “little and large griefs” and shows that focusing only on death-related grief may devalue losses in childhood that are not related to death. Our findings demonstrate that grief is never isolated, but configured with a variety of other emotions and feelings, and strongly related to children’s own sense-making and worldviews. Attention to emotional configuration shifts our focus from individual grief to the wider cultural-historical practices and sense-making processes in which grief is always intertwined.

Childhood life events of women enrolled in the Avon Longitudinal Study of Parents &amp; Children (ALSPAC)

At the time of planning ALSPAC there was accumulating evidence that abuse and other childhood traumas were related to psychiatric problems later in life. In addition, the age at which such trauma occurred was likely to be important in influencing its long-term impact. Detailed data was therefore collected from enrolled women on traumatic events occurring during their own childhoods, along with their age at the time. The questionnaire entitled ‘About Yourself’ was sent out to expectant women who had enrolled in the study, which included a page in the form of a grid (an events diary) with one row per year of childhood and columns for recording where she was living at the time, who was looking after her, and any traumatic events that occurred. These free-text responses were then coded, and any events were assigned a score indicating the level of trauma the event was likely to have caused on a scale of 1 (highly traumatic) to 6 (least traumatic). This paper describes the variety of text data collected and how it was coded. The ALSPAC study has a great deal of follow-up data collected on the original respondents, as well as on their parents and grandparents, partners, offspring and their grandchildren, providing huge potential for analyses on the antecedents and outcomes of adverse childhood events across multiple generations.

Effects of Early Adverse Life Events on Depression and Cognitive Performance from the Perspective of the Heart-Brain Axis.

Early adverse life events (EALs) increase susceptibility to depression and impair cognitive performance, but the physiological mechanisms are still unclear. The target of this article is to clarify the impact of adverse childhood experiences on emotional and cognitive performance from the perspective of the heart-brain axis. We used the Repeatable Battery for the Assessment of Neuropsychological Status (RBANS) to test cognitive function and the Childhood Trauma Questionnaire (CTQ) to assess adverse childhood experiences. Heart rate variability (HRV) and electroencephalograms (EEG) were acquired at rest. We observed that subjects with depression had experienced more traumatic events during their childhood. Furthermore, they exhibited lower heart rate variability and higher power in the delta, theta, and alpha frequency bands. Moreover, heart rate variability partially mediated the association between childhood trauma exposure and depressive symptoms. Our findings suggested that adverse life events in childhood could influence the development of depression in adulthood, which might be linked to cardiac autonomic dysfunction and altered brain function.

Development and validation of a short version of the questionnaire of stressful life events (QSLE).

Stressful life events (SLE) tend to occur before the onset of psychosis, this highlights the importance of its detection and evaluation in these patients. The need to have instruments that assess SLE easily and quickly underpins the objective of this study, which is to validate a short version of the questionnaire of stressful life events (QSLE). 124 patients with first-episode psychosis and 218 healthy controls aged between 11 and 52 years were recruited. The QSLE scale underwent discrimination analysis, which revealed 18 items had good SLEs discriminability between the two samples. These 18 items were then used to create the shorter QSLE-SV. The QSLE-SV showed good internal consistency (Cronbach's alpha =0.749). An AUC of 0.830 was observed, suggesting that the predictor was good. Using 2 as the cut-off score to predict an individual as a patient would yield a sensitivity of 91.1% and a specificity of 51.6%, and using a cut-off point of 3, the sensitivity was 77.4% and the specificity was 72.5%. QSLE-SV displayed satisfactory psychometric properties in a Spanish population. The QSLE-SV allows for investigating childhood, adolescent and adult life events by measuring current stress and age on a continuous scale in a quick and easy way.

Childhood life events of women enrolled in the Avon Longitudinal Study of Parents & Children (ALSPAC).

At the time of planning ALSPAC there was accumulating evidence that abuse and other childhood traumas were related to psychiatric problems later in life. In addition, the age at which such trauma occurred was likely to be important in influencing its long-term impact. Detailed data was therefore collected from enrolled women on traumatic events occurring during their own childhoods, along with their age at the time. The questionnaire entitled 'About Yourself' was sent out to expectant women who had enrolled in the study, which included a page in the form of a grid (an events diary) with one row per year of childhood and columns for recording where she was living at the time, who was looking after her, and any traumatic events that occurred. These free-text responses were then coded, and any events were assigned a score indicating the level of trauma the event was likely to have caused on a scale of 1 (highly traumatic) to 6 (least traumatic). This paper describes the variety of text data collected and how it was coded. The ALSPAC study has a great deal of follow-up data collected on the original respondents, as well as on their parents and grandparents, partners, offspring and their grandchildren, providing huge potential for analyses on the antecedents and outcomes of adverse childhood events across multiple generations.

Stressful Life Events in Children Aged 3 to 15 Years During the COVID-19 Pandemic: A Latent Class Analysis.

Although several studies have reported an increase in psychological problems during the COVID-19 pandemic, the impact of stressful life events on Spanish children and adolescents using a person-oriented statistical approach and the relationships between the profiles and emotional and behavioral symptoms have not yet been examined. The present study aims to identify profiles of Spanish children and adolescents, considering life-threatening stressful events during the COVID-19 pandemic. Participants were 252 parents of children aged 3 to 15 years old who completed an online structured questionnaire that collected information about stressful life events related to the pandemic and its impact on their children's welfare. Through Latent Class Analysis (LCA), four profiles of children and adolescents were found according to the stressful events experienced: "COVID infection, social confinement", "economic loss", "reduced social contact" and "parental stress", with no significant age or gender differences. Reduction in social contact was the most prevalent stressor. Comparisons of psychological symptoms across latent classes were analyzed. The findings increase our understanding of how stressful life events during the COVID-19 situation impacted young people's psychological welfare and highlight the need to promote strategies to prevent emotional problems during a pandemic considering the identified profiles.

Childhood adversities and post-military-service incarceration in a male UK Armed Forces Veteran sample from Northern Ireland

LAY SUMMARY Experiencing stressful or traumatic events in childhood has been linked with negative outcomes later in adulthood, one of which is involvement with the criminal justice system. This study explored whether there was a relationship between experiencing stressful life events in childhood and incarceration in adulthood (post-military service) among UK Armed Forces Veterans based in Northern Ireland (NI). Some individuals may experience only one type of adversity, some may experience many types of adversities, and others may experience no adversity. This study used a statistical technique (latent class analysis) that allowed the authors to explore how adverse childhood experiences (ACEs) varied among a sample of UK Armed Forces Veterans residing in NI. It revealed four groups of Veterans, each characterized by different types of experiences in childhood. The authors explored whether belonging to these groups increased the likelihood of incarceration, finding that those who experienced multiple adversities were at greater risk of incarceration after military service. Personnel involved in the care and support of military personnel should consider military personnel’s history of multiple ACEs.

Bereavement in childhood and young adulthood and the risk of atrial fibrillation: a population-based cohort study from Denmark and Sweden

BackgroundAdverse childhood life events are associated with increased risks of hypertension, ischemic heart disease, and stroke later in life. Limited evidence also suggests that stress in adulthood may increase the risk of atrial fibrillation (AF). Whether childhood adversity may lead to the development of AF is unknown. We investigated whether the loss of a parent or sibling in childhood is associated with an increased risk of AF and compared this effect to that of similar losses in young adulthood.MethodsWe studied 6,394,975 live-born individuals included in the Danish (1973–2018) and Swedish Medical Birth Registers (1973–2014). We linked data from several national registers to obtain information on the death of parents and siblings and on personal and familial sociodemographic and health-related factors. We analyzed the association between bereavement and AF using Poisson regression.ResultsLoss of a parent or sibling was associated with an increased AF risk both when the loss occurred in childhood and in adulthood; the adjusted incident rate ratios and 95% confidence intervals were 1.24 (1.14–1.35) and 1.24 (1.16–1.33), respectively. Bereavement in childhood was associated with AF only if losses were due to cardiovascular diseases or other natural causes, while loss in adulthood was associated with AF not only in case of natural deaths, but also unnatural deaths. The associations did not differ substantially according to age at loss and whether the deceased was a parent or a sibling.ConclusionsBereavement both in childhood and in adulthood was associated with an increased AF risk.

A latent class analysis of adverse childhood life events in Ugandan adolescents

This study aimed to characterise adverse childhood events (ACEs) experiences of school-going Ugandan adolescents (female = 50.6%, with diagnosis of post-traumatic stress disorder: PTSD = 38.2%; mean age = 15.9 years, SD = 1.2 years). The children completed the Harvard Trauma Questionnaire. Latent class analysis yielded three groups of “low risk” (individuals with low probabilities of experiencing most of the adverse life events), “intermediate risk” (individuals with higher probability of being exposed to adverse life events compared to the low-risk group), and “high risk” (individuals with extremely high probabilities of having experienced all the adverse life events). Compared with the low-risk class, the high-risk class was found to be significantly more likely to have a diagnosis of PTSD. Being a female may be an antecedent risk factor for high exposure to ACE in the Ugandan setting. These findings indicate the feasibility of grouping Uganda children with ACEs for targeted treatment interventions.

Stressful life events, psychosocial health and general health in preschool children before age 4

BackgroundThe impact of stressful life events (SLEs) in early childhood is often ignored. We aimed to examine longitudinal associations between SLEs and psychosocial and general health in preschool children.MethodsTwelve SLEs occurring before the age of 24 months were assessed and categorized by frequency (no events, 1–2 SLEs, and > 2 SLEs) and overall tension (no events, low, and high) (n = 1431). Psychosocial and general health were measured three times at the age of 24, 36 and 45 months. The associations were examined by logistic regression models using generalized estimating equations to handle repeated measurements.ResultsHalf (48.4%) of the families experienced SLEs, and 23.8% perceived high-tension SLEs before the children were aged 24 months. Gender differences were observed in the association between SLEs and psychosocial health. Compared to girls without SLEs, girls who experienced > 2 SLEs [OR = 3.31, 95% confidence interval (CI) 2.05–5.35] or high-tension SLEs (OR = 3.01, 95% CI 2.07–4.39) had higher odds of psychosocial problems from 24 to 45 months. The odds ratios in boys were 2.10 (95% CI 1.36–3.24) and 1.47 (95% CI 1.06–2.03), respectively. Moreover, only girls’ risk of psychosocial problems increased after experiencing 1–2 SLEs (OR = 2.15, 95% CI 1.54–3.00) or low-tension SLEs (OR = 1.90, 95% CI 1.31–2.74). Regarding general health, children who experienced > 2 SLEs (OR = 1.96, 95% CI 1.21–3.18) and high-tension SLEs (OR = 1.60, 95% CI 1.12–2.28) had higher odds of poor general health from 24 to 45 months.ConclusionsThe findings emphasized that young children’s psychosocial and general health can be impacted by experiencing SLEs in early childhood. Attention and adequate support for families experiencing SLEs are needed to minimize the potential negative effect of SLEs on child health, particularly in girls.

Nightmare distress is related to traumatic childhood experiences, critical life events and emotional appraisal of a dream rather than to its content.

Nightmares are a substantial burden for sleep quality. Previous studies have shown that traumatic experiences can increase the probability of nightmares, and also waking-life distress can enhance this effect. There is evidence that the intensity of negative dream emotions is more responsible for rating a dream as a nightmare than threatening dream contents. However, there is still a lack of research concerning effects on nightmare distress. We hypothesise that traumatic childhood experiences (such as emotional abuse, obtained by the Childhood Trauma Questionnaire), critical life events (obtained by the Social Readjustment Rating Scale) and threatening dream contents are associated with nightmare distress. A sample of N= 103 participants kept a dream diary over 28 consecutive days. About 60% of the sample were frequent nightmare dreamers. The participants recorded their violent dream contents and dream emotions in their diary. To predict nightmare distress, regression models were constructed; nightmare distress was measured with the Nightmare Distress Questionnaire. Results showed that emotional abuse in childhood and critical life events predicted nightmare distress. Moreover, violent dream contents were associated with nightmare distress but, after we controlled for nightmare frequency and the intensity of negative dream emotions, the significant impact of violent dream contents decreased. The results suggest that the emotional appraisal of a dream has a substantial influence on nightmares in addition to traumatic childhood experiences and critical life events.

Development and Validation of the Weighted Index for Childhood Adverse Conditions (WICAC).

Background: Adverse experiences in childhood are a major public health concern, promoting social inequality in health through biopsychosocial mechanisms. So far, no known measures comprehend the complexity and variations of severity of adverse events. This study aims to develop and validate a new index: the Weighted Index for Childhood Adverse Conditions (WICAC). Methods: The population consists of 7493 randomly invited men and women aged 18–72 years. Data were collected in 2012–2015 as part of the Danish Study of Functional Disorders (DanFunD). Content and construct validation of the WICAC was performed with the hypothesis testing of multiple biopsychosocial outcomes: cardiovascular disease, cancer, poor health, back pain, BMI, obesity, anxiety, depression, low vitality, subjective social status, lower education, smoking, and alcohol consumption. Data were analysed with binominal and linear regression models with risk ratios (RR) and mean differences (MD). Results: Content validation is fitting for WICAC. The strongest associations observed were for most severe adversity: Poor Health RR = 2.16 (1.19–2.91), Anxiety RR = 3.32 (2.32–4.74), Heavy Drinking RR = 4.09 (1.85–9.04), and Subjective Social Status MD = −0.481 (−0.721–(−0.241)). Similar results were found for the remaining outcomes. Discriminative validation was undecided. Conclusions: WICAC is an adequate instrument for measuring cumulative adverse life events in childhood and adolescence for research purposes.