Examination of the importance of anger/irritability and limited prosocial emotion/callous-unemotional traits to understand externalizing symptoms and adjustment problems in adolescence: A 10-year longitudinal study

Introduction Externalizing symptoms and adjustment problems of youths in residential care

Recent studies showed that individuals who grew up in residential youth care were more at risk for a large array of psychological problems, including internalizing and externalizing symptoms (15). Indeed, growing up in residential youth care may lead to experience stress (6). Youths have to adjust to a new environment (i.e., residential youth care) as well as to cope with the reasons leading to the placement, such as instable, violent, neglecting, or inappropriate family environment (e.g., death of a parent, mental illness of a parent, abuse and neglect, and recurrent family conflicts). All of these factors, especially when youths do not have access to sufficient internal and external resources to cope with these situations, generate chronic stress [see, e.g., (7)]. Chronic stress was, in turn, related to the development of maladaptive coping and regulation strategies when confronted to a new situation of stress, such as anger outburst, violent behaviors, or excessive anxiety, which are known factors facilitating the development of persisting adjustment problems (5, 810).

Adjustment problems are defined in the literature as a large category of different features of dysfunction, including internalized symptoms such as anxiety, depression, withdrawal, and/or externalized symptoms such as aggressive, violent, or antisocial behaviors, significantly impacting the psychosocial wellbeing of an individual and their integration in the society (1114).

In some individuals, externalizing, or more broadly adjustment, problems reach a peak at adolescence and gradually decline into adulthood following a natural desistance pathway, while in others, such difficulties may be more profoundly anchored in functioning, increasing the risk of developing psychiatric disorders or of settling in a criminal career (1522). Factors predictive of long-term adjustment or externalizing problems are therefore an important area of research to foster preventive care strategies.

Emotional features of youths with externalizing or adjustment problems

One important notion that might help to understand why an individual follows a specific trajectory is the presence of specific emotional features (1822). Indeed, difficulties in regulating emotions such as anger/irritability or, on the opposite, difficulties in accessing or feeling emotions (limited prosocial emotions/callous-unemotional traits—LPE/CU) were evidenced in individuals exposed to chronic life stress environment and were shown to be associated with externalizing symptoms (2326). In particular, high levels of anger/irritability in children were observed to be associated with aggression and conduct problems (2729) and emotional lability later in life (30). The fifth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-V) included an “anger/irritability” component in the diagnostics of oppositional defiant disorder and conduct disorder [e.g., (31)]. In addition, chronic anger was observed to be a precursor of antisocial personality disorder (32). LPE/CU traits were related to psychopathic personality traits (3336) and were shown to be predictive of externalizing behaviors in adulthood (37, 38).

Cumulative effects

Although there is evidence of a co-occurrence of anger/irritability and LPE/CU in different DSM-V diagnostic categories related to externalizing behaviors (39, 40), only few studies examined both characteristics conjointly. However, the cumulative effects of negative factors might increase the risk of impaired life trajectories (41). In a previous cross-sectional study of our team (25), we examined the role of age of onset of externalizing behaviors, anger/irritability, and LPE/CU in antisocial behaviors (delinquency and externalizing symptoms) in institutionalized adolescents. We observed a specific influence of the three factors in understanding antisocial behaviors, but also a cumulative effect explaining the types of offenses committed. Likewise, Waschbusch et al. (42) assessed the role of irritability and LPE/CU in externalizing and internalizing symptoms in children with attention-deficit/hyperactivity disorder, oppositional defiant disorder, and/or conduct disorder, but also in typically developing children. They observed a unique association between irritability and LPE/CU, and internalizing/externalizing symptoms, but also a cumulative effect on proactive aggression and on functional impairments (i.e., relationships with peers or adults, behavior in class, or self-esteem). Nevertheless, to the best of our knowledge, no studies considered both emotional features to predict long-term externalizing and/or adjustment problems within a transdiagnostic approach (i.e., focusing on a dimensional perspective of symptoms) among individuals with a residential care history into adulthood.

The current study

As described above, anger/irritability and LPE/CU are two important emotional features associated with externalizing symptoms [e.g., (13, 14, 39, 40)]. Moreover, previous cross-sectional studies [e.g., (25, 42)] reported a negative cumulative effect (more negative impact in the presence of both risk factors) in different aspects of children’s behaviors and socialization. However, previous studies used a cross-sectional design. Thus, no longitudinal evidence is available. Moreover, these features have scarcely been studied in a vulnerable sample of young adults with a residential care history (at risk sample). Therefore, the aims of the present study are twofold: (a) to investigate the development of anger/irritability problems and LPE/CU traits from adolescence into adulthood among individuals with a history of residential care, and (b) to examine to what extend these emotional features predict externalizing problems and adjustment problems over this period. We hypothesize a reduction of symptoms over time. Furthermore, we expect a simple effect of the emotional features (direct effect of anger/irritability as well as LPE/CU) and a negative cumulative effect. Our findings will give more insight into the conjoint effect of both emotional factors from adolescence into adulthood on externalizing problems and adjustment problems in this high-risk population.

Materials and methods Sample and procedure

The data were collected within the “Youth welfare trajectories: learning form experience” [“Jugendhilfverlaüfe: Aus Erfahung lernen” (JAEL)] project, a 10-year follow-up study of the “Clarification and Goal-Attainment in Child Welfare and Juvenile-Justice Institutions” [“Modellversuch zur Abklärung und Zielerreichung in stationären Massnahmen” (MAZ); (43) study]. The mean interval between baseline and follow-up was 9.7 years (range = 7–12 years). The study is a broad investigation of emotional and behavioral characteristics of youths who lived in institutions in Switzerland. Five hundred and ninety-two children, adolescents, and young adults from 64 Swiss child welfare and juvenile justice institutions were included at baseline. From the 592 participants at baseline, 511 youths agreed to be contacted again for the follow-up. However, 137 could not be reached (no trace found = 8; dead = 8; never answered to our solicitations = 121). Of the 374 participants reached, 231 consented to participate to the follow-up study, and 203 participants filled out all online questionnaires (accessed through a personal link via email). The socio-demographic characteristic of the sample is described in Table 1. Each participant gave their written consent after having received the information about the study. The procedure was approved by the Northwest- and Central-Swiss Ethics committee (Ethikkommission Nordwest- und Zentralschweiz). Then, each participant filled in self-report measures (see below for details).

TABLE 1

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Table 1. Socio-demographic characteristics (n = 203).

Measures Outcome

Psychopathological symptoms were assessed with Youth Self-Report (YSR) (44) and the Young Adult Self-Report (YASR) (45). Each participant rated items describing common emotional and behavioral difficulties. Each response is rated on a three-point Likert scale from “not true” to “often true.” We used the externalizing symptoms score. Raw scores were transformed into T-scores to merge data from the different versions administered in function of the age of the participants. Moreover, to assess adjustment problems, the T-scores of externalizing symptoms and internalizing symptoms were averaged, as proposed in previous studies (13, 14). Higher scores indicate more symptoms. All Cronbach’s αs are higher than 0.84. This measure has been administered at baseline and at follow-up.

Predicting factors

The Affective scale of the Youth Psychopathic Traits Inventory (YPI) (46), a 50-item self-report questionnaire, was used to assess LPE/CU (baseline’s α = 0.84; follow-up’s α = 0.78). Each item is rated on a four-point Likert scale ranging from 0 = “does not apply at all” to 3 = “apply very well.” Higher scores indicate higher limited prosocial emotion/callous-unemotional traits. This measure has been administered at baseline and at follow-up.

The anger/irritability scale of the Massachusetts Youth Screening Instrument-Second Version (MAYSI-2) (47), a screening questionnaire with 52 questions, was used to assess anger/irritability (baseline’s α = 0.78; follow-up’s α = 0.83). Each item is rated either as 1 = “yes” or 0 = “no” considering the past month. Higher scores indicate more anger/irritability. This measure has been administered at baseline and at follow-up.

Early adversity

Early adversities (i.e., physical abuse, emotional abuse, physical neglect, emotional neglect, and sexual abuse) were collected at follow-up using the short form of the Child Trauma Questionnaire (CTQ-SF) (48), a 28-item self-report questionnaire. Each item is rated on a five-point Likert-type scale ranging from 0 = “never true” to 4 = “very often true.” We use the total score of the CTQ (Cronbach’s α = 0.90), with a higher score reflecting more adversity during childhood. This measure has been administered only at follow-up to encompass all adverse events.

Data analysis

First, we reported descriptive statistics and compared the groups of youths included in the follow-up from those who dropped out from the study (i.e., sample attrition analysis). Also, we provide descriptive sample characteristics for sociodemographic variables. As we did not observe any systematic variation from sample attrition analyses (see below), we ran the analyses with the data at disposal without implementing missing data (i.e., case analyses). Parametric tests were conducted as the data suit Gaussian distribution (i.e., skewness and kurtosis and Q-Q plots were inspected). Repeated analyses of covariance (RM-ANCOVA) controlling for gender, age at baseline, and early adversities were computed to assess the differences between baseline and follow-up for the emotional features and psychopathological symptoms. Correlational analyses are provided in Supplementary File 1. Afterward, we conducted four multivariate linear regression models explaining externalizing symptoms or adjustment problems as well as their changes over the follow-up period by the predicting factors [i.e., anger/irritability, LPE/CU, changes (or delta), and their cumulative effect] as well as the control variables (i.e., gender, age at baseline, and early adversities). Changes over the follow-up period (or delta) scores were computed by subtracting the baseline scores from the follow-up scores, higher scores thus reflecting a worsening or an aggravation of symptoms with time.

Results Descriptive and drop-out analyses

The socio-demographic characteristic of the sample is described in Table 1. The participants were on average of 26 years of age, and around 34% were women. Most of the youths were born in Switzerland (80.9%) and single at baseline (90.9%). Regarding their education, a minority dropped out of mandatory school and did not achieve basic education (4.7%). Concerning their incomes, almost half of the sample are employed or at school (45.2%) but an important part gets public financial support (42.8%). Almost half of the participants are not satisfied with their income (43.7%).

Table 2 shows descriptive data and drop-out (or attrition) analyses. No difference is observed between the youths included in the follow-up compared to those who dropped out from the study, indicating no apparent selection bias.

TABLE 2

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Table 2. Descriptive and drop-out analyses.

Changes over time

The RM-ANCOVA revealed no change over time (see Table 3).

TABLE 3

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Table 3. Baseline vs. follow-up comparisons.

Externalizing behaviors

The regression analysis revealed that a significant proportion of the variance of externalizing behaviors at follow-up younger age at baseline, more externalizing symptoms at baseline, higher anger/irritability at baseline, and more worsening in anger/irritability with time are predictive of higher externalizing scores at follow-up, F(10, 119) = 8.24, p < 0.001, R2 = 0.431, and adjusted R2 = 0.378 (Table 4).

TABLE 4

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Table 4. Prediction of externalizing behaviors at follow-up.

The regression analysis with the worsening with time in externalizing scores as outcome revealed that younger age at baseline, lower externalizing symptoms at baseline, higher anger/irritability at baseline, and a worsening of anger/irritability with time are associated with more worsening in externalizing scores over the 10-year follow-up, F(10, 119) = 19.19, p < 0.001, R2 = 0.638, and adjusted R2 = 0.604 (Table 5).

TABLE 5

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Table 5. Prediction of aggravation in externalizing behaviors over time (delta).

Adjustment problems

The regression analysis performed with adjustment problems at follow-up as outcome revealed that younger age at baseline, more anger/irritability, and a worsening in anger/irritability over time are related to more adjustment problems at follow-up, F(9, 119) = 9.72, p < 0.001, R2 = 0.471, and adjusted R2 = 0.423 (Table 6).

TABLE 6

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Table 6. Prediction of adjustment problems at follow-up.

The regression analysis with the aggravation of adjustment problems over time as outcome revealed that younger age at baseline, lower adjustment problems at baseline, more anger/irritability, and a worsening of anger/irritability over time are related to more aggravation in adjustment problems over the 10 years, F(10, 119) = 20.81, p < 0.001, R2 = 0.656, and adjusted R2 = 0.625 (Table 7).

TABLE 7

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Table 7. Prediction of impairment of adjustment problems (delta).

Discussion

The objectives of the present study were (a) to investigate the development of anger/irritability problems and LPE/CU from adolescence into adulthood among individuals with a history of residential care and (b) to what extend these emotions predict externalizing problems and its development and adjustment problems over this period.

First, the results of the study showed no changes in anger/irritability, LPE/CU, externalizing behaviors, and adjustment problems from adolescence into young adulthood, when most of them transited to other living styles (e.g., back to their family, with friend, with a partner or alone). Second, displaying more externalizing behaviors or adjustment problems, being younger, and showing more anger/irritability when in institution, as well as an increment in anger/irritability over time predicted more externalizing behaviors/adjustment problems 10 years later. Furthermore, an aggravation in externalizing symptoms/adjustment problems over the 10 year was found to be predicted by a younger age at baseline, a lower level of externalizing symptoms while in institution, but a higher level of anger/irritability and an aggravation of anger/irritability over time. LPE/CU was not found to be predictive of either externalizing symptoms or adjustment problems. Below these results are discussed in light of previous literature.

Developmental aspects

Contrary to some studies in the general population (17, 22), we did not observe that psychopathological symptoms (i.e., externalizing behaviors or adjustment problems) are more prevalent in adolescence and decline in adulthood. Our study examined youths at risk, who live in residential care facilities which might account for the differences. Indeed, chronic stress has been observed to be associated with the development of maladaptive coping and regulation strategies which may facilitate the development of persistent externalizing behaviors as well as adjustment problems (5, 810).

Younger age at baseline was a significant predictor for higher externalizing and adjustment problems 10 years later, as well as regarding the aggravation of externalizing and adjustment problems during the study span. These results may be explained by the fact that younger participants were in late childhood/early adolescence at the baseline assessment, and due to their young age not engaged in delinquent activities yet (i.e., showed lower externalizing problems). With time, older participants naturally desisted from these activities, while younger participants were probably still in the peak of adolescence-driven behaviors at the follow-up assessment, which is why they reported more externalizing and adjustment problems than older participants at the follow-up.

Predicting externalizing and adjustment problems and their aggravation over 10 years

In line with previous literature, anger regulation difficulties were related to externalizing symptoms and adjustment problems [e.g., (20, 25, 4952)]. However, it is interesting to note that this factor is predictive for levels in externalizing and adjustment problems even 10 years later. Our study showed that a deterioration in anger/irritability with time was related to higher externalizing and adjustment problems and that it was also predictive of a deterioration of externalizing and adjustment problems 10 years later. These results are in line with evidence showing that irritability is related to long-term adverse outcomes, such as social impairment, low educational achievement, more delinquency, suicidality, and a higher prevalence of adult depression or anxiety (5363). As the prevalence of mild irritability ranges from 20 to 30% (61, 64) and 1 to 3% for severe chronic forms of irritability (6568), it should become a target of early assessment and early intervention.

Clinical and preventive implications

Our results plead for systematic early intervention aiming at improving emotion regulation in institutions for adolescents showing anger/irritability problems. Adolescence is a pivotal period in terms of brain plasticity which offers a unique window of opportunity to alleviate future difficulties (69). In that sense, a consortium of experts (70) highlighted the existence of an urgent and important need to develop psychological interventions to manage emotion dysregulation, among other symptoms, to alleviate psychological sufferance. Furthermore, there is a need for methodologically sound studies evaluating innovative treatments based on theory and evidence and integrating an interdisciplinary perspective in the context of early intervention and prevention in at-risk populations should be a top priority (70). More specifically, matching proposed interventions to the specific deficits observed is essential to increase the benefits (71, 72). In addition, there is an urgent need to evaluate innovative interventions based on recent neurobiological findings in youth with externalizing symptoms (73), and from a criminological perspective, it is essential to develop a more integrative approach (74).

As a prevention to reduce anger dysregulation, residential care institutions may therefore implement individual or group programs aiming at an early identification of those problems. In particular, many different psychotherapeutical approaches exist to help individual regulate their anger and irritability. A scoping review (75) listed the existing interventions for self-regulatory control processes (including anger regulation and irritability) in youth with externalizing behaviors. However, many interventions involve parents, such as parent management training or cognitive-behavioral therapy [for a review see Sukhodolsky et al. (76)], which may be difficult in adolescents in institutions. A recent review of meta-analyses investigating usefulness of anger-related interventions reported that cognitive-behavioral therapies were the most effective for anger-related problems among adolescents and adults (77). In particular, currently the START NOW, an emotional regulation training, is under assessment in institutions in the residential care in Switzerland.1

From a neurobiological perspective, an interesting tool that might help to enhance anger management of the youths is heart rate variability biofeedback (HRVB). Indeed, HRVB allows, through simple breathing exercises coupled with positive emotions such as compassion, caring, or appreciation, to balance somatic (balance between the autonomic and central nervous system) and psychological processes (e.g., thoughts and emotions). This enhances the abilities of the individuals to better cope with the difficulties and challenges of their daily lives (78, 79) and improves their resilience (80). Numerous meta-analyses have demonstrated the effectiveness of this type of tool in reducing perceived stress, depression, and anxiety in adults (8183) as well as in children and adolescents (84, 85). Likewise, neurofeedback seems a promising therapeutical approach to enhance emotion regulation skills. Indeed, neurofeedback refers to an brain training changing the number of synapses between neurons through learning and conditioning (86) improving the voluntary regulation of specific brain regions (87). It was demonstrated to be effective in improving self-control (8891). Thus, such tools empower young people and may help them to improve their ability to cope with anger.

Recently, we have seen the emergence of new intervention methods applied mainly to the field of youth. These tools are presented in the form of mobile applications and allow the user to record a reaction (behavioral and/or cognitive) that he or she has had, at a specific time, in his or her environment and in response to a stimulus. These kinds of ecological momentary interventions (EMI) which refer to “treatments that are provided to people during their everyday lives (i.e., in real time) and in natural settings (i.e., real world)” (92) represent novel and preventive approaches, particularly adapted to young people. When such interventions are coupled and thus adapted by ecological momentary assessment (EMA), it allows the development of a just-in-time adaptive intervention (JITAI) providing a personalized intervention based on real-time assessment (93). JITAI provides the right type and amount of support at the right time (94). Technological advances offer the opportunity to create EMIs and, in particular, JITAI, which has the potential to modify the therapeutic treatment (95) by providing psychological intervention at the best time, in a real-world setting. A scoping review (96) was recently conducted on EMIs and retrieved 64 studies on EMIs. These interventions allow to capture intra-individual variability over time, resulting in a more realistic picture of the individuals’ emotional life (i.e., anger regulation) and allowing to provide the best advice or support at the best time (i.e., anger management).

Finally, another promising recent tool that might help these youths is virtual reality (VR). VR consists in immersing the patient in virtual environment to mimic real-life interactions and environment in order that the patient has the feeling of “real” experience (97). In particular, some of the advantages of VR treatment are high ecological validity, exposition to situation that are not possible in real-life situations, high level of control of the environment and the triggers of the problematic behaviors or symptoms (without endangering others), and high immersion in the situation (98). A systematic review demonstrated the value of this approach in the field of mental health treatment (99). Indeed, this systematic review demonstrated that VR treatment is as effective as classical cognitive-behavioral therapies and surpasses waiting list or control group. In particular, VR treatment allows the patient to learn practical skills needed in life outside the institutions (e.g., anger management) in a protected environment without leaving the institutions (100). More specifically, a promising treatment developed in this domain is the Virtual Reality Aggression Prevention Training (VRAPT). VRAPT has been shown to reduce hostility and non-planning impulsiveness as well as improve anger control at post-treatment, which was, however, not maintained at follow-up (101). However, more studies are warranted in this line to assess the potential of VR in helping youth for anger management.

Limitations

The findings of our study should be interpreted in light of some limitations. First, the use of self-reported data only, relying on the individual introspective and self-observational capacities, is an important limitation to the study. Considering other sources of information (e.g., parents or caregivers) might have given us a more objective view of the phenomenon.

Second, the regression analysis explained a high proportion of the variance in externalizing and adjustment symptoms at 10-year follow-up and even more in the worsening of externalizing symptoms. However, an important proportion of the variance remains to be understood. Therefore, future studies should include other self-regulatory control processes (e.g., cognitive control, heart rate variability) to disentangle the effects of different predictors for externalizing and adjustment problems.

Finally, this study considered a high-risk sample of individuals formerly in residential care institutions, representing a heterogeneous sample. Therefore, our results cannot be generalized to other settings of care or clinical populations. Thus, more studies in different care settings, countries, and with different samples are needed.

Conclusion

The findings of our study showed that anger/irritability and LPE/CU were high among children and adolescents in out-of-home care. Psychopathological symptoms diminished from adolescence in the transition to adulthood. Anger/irritability represents a risk factor for adjustment and externalizing problems in young adulthood among this high-risk population. The care systems and child and adolescent psychiatry are thus faced with the challenging objective to provide a successful transition from out-of-home care into an independent adult life for individuals with emotion regulation difficulties and externalizing problems. Together, our findings plead (a) for systematic assessments of anger/irritability problems and (b) early interventions which aim to improve anger/irritability in out-of-home placed adolescents. In such, anger/irritability might be seen as a temperamental characteristic that develops during childhood related to experiences and that might become a psychopathological symptom when it impairs functioning. However, more studies are needed to examine the underlying process sustaining the emergence of pathological irritability as well as to understand the effects of other factors influencing externalizing problems and adjustment problems with larger sample and across different care settings.

Data availability statement

The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.

Ethics statement

The studies involving human participants were reviewed and approved by Institutional Review Board of the State of Basel. Written informed consent to participate in this study was provided by the participants’ legal guardian/next of kin.

Author contributions

JF, KS, CB, and MS were responsible for the project design, funding, and supervision of the whole study. SH, JP, DB, and SS participated in the data collection. SU conducted the data analyses. SU, SH, and JP interpreted data and drafted the different versions of the manuscript. All authors contributed critically to the numerous versions of the manuscript, contributed to the article, approved the submitted version, and agreed to be accountable for the content of the work.

Funding

This study was funded by the Ministry of Justice.

Acknowledgments

We thank 64 Youth Welfare and Juvenile Justice Institutions, especially the young adults who offered their time for the assessments.

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

Supplementary material

The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fpsyt.2022.939603/full#supplementary-material

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