Psychiatric Comorbidity in Children with Autism Spectrum Disorders: A Comparison with Children with ADHD

The present study was conducted with the aim to identify comorbid psychiatric disorders in children with autism spectrum disorders (ASD) (n = 40) and to compare those comorbidity rates to those in children with attention deficit hyperactivity disorder (ADHD) (n = 40). Participants were clinically referred children aged 7–18 years. DSM-IV classifications were used for the primary diagnosis (ASD/ADHD), while comorbid psychiatric disorders were assessed using a structured diagnostic interview, the structured clinical interview for DSM-IV, childhood diagnoses (KID-SCID). Twenty-three children with ASD (57.5 %) had at least one comorbid disorder, whereas 16 children with ADHD (40.0 %) were classified as having at least one comorbid disorder. No group differences were found with respect to this comorbidity rate or for the rate of comorbid externalizing disorders (ODD and/or CD). However, children with ASD had more comorbid internalizing disorders compared to children with ADHD. More specifically, children with ASD had higher rates of anxiety disorders, but not mood disorders. No associations between comorbidity and age or between comorbidity and the intelligence quotient was found. It is important for clinicians to always be aware of, and screen for, comorbidity, and to consider treatment for these comorbid disorders. In addition, research should focus on establishing valid and reliable screening tools as well as effective treatment options for these comorbid disorders.     

The Relationship Between Child-Reported Positive Affect and Parent-Reported Emotional and Behavioral Problems in ADHD Youth

Although the adaptive role of positive affect (PA) in childhood internalizing disorders is well-established, less is known about PA in children with Attention-Deficit/Hyperactivity Disorder (ADHD). In this cross-sectional study, we examined associations between child-reported PA and parent-reported emotional and behavioral problems in youth with ADHD using multiple hierarchical regression analyses. Participants included 848 ethnically diverse youth (253 youth with ADHD, 595 with other or no diagnoses; age range 6.12–19.65) referred for mental health assessments. Study measures included the Child Behavior Checklist (CBCL) and the Positive and Negative Affect Scale for Children (PANAS-C). Results indicated that higher levels of child-reported PA were associated with greater parental reports of total and internalizing problems among youth with ADHD but not in other clinic-referred youth. Specifically, child self-reports of PA were positively associated with parental reports of anxious/depressed and somatic problems in youth with ADHD. In addition, associations between child-reported PA and parent-reported problems differed by type of ADHD comorbidity. Findings suggest that at higher levels, PA in youth with ADHD might exert a paradoxical effect and be a subtle risk factor for or an indicator of parent-reported internalizing problems among youth with ADHD only and youth with ADHD and a comorbid externalizing disorder but not for youth with ADHD and a comorbid internalizing disorder or youth without ADHD. Discrepancies between child-reported PA and parent-reported problems may influence treatment planning and treatment response. Further clinical and theoretical implications for child therapists and parents are discussed.     

Test of Alternative Hypotheses Explaining the Comorbidity Between Attention-Deficit/Hyperactivity Disorder and Conduct Disorder

There is significant comorbidity between attention-deficit/hyperactivity disorder (ADHD) and conduct disorder (CD). The conclusions of studies that examined the causes of comorbidity between ADHD and CD conflict, with some researchers finding support for the three independent disorders model and others finding support for the correlated risk factors model. We tested these models and eleven alternative hypotheses using the same analytical approach. The participants were 110 monozygotic twin pairs and 181 dizygotic twin pairs recruited from the Colorado Learning Disabilities Research Center Twin Study. The three independent disorders model did not fit the data, whereas the correlated risk factors model fit the data well. Several other comorbidity models fit the data as well as or better than the correlated risk factors model. The results suggest that correlated risk factors are a better explanation for the comorbidity between ADHD and CD than a third, independent ADHD+CD subtype.     

Gender differences in comorbid disorders among offenders in prison substance abuse treatment programs

This study examined gender differences in a range of lifetime psychiatric disorders in a sample of 272 offenders newly admitted to a prison substance abuse program. Although these men and women did not differ in severity of substance use in the six months prior to incarceration, women were significantly more likely than men to report a lifetime psychiatric disorder and a lifetime severe disorder. Furthermore, gender differences emerged in the pattern of lifetime psychiatric comorbidity. Women reported greater lifetime major depression, posttraumatic stress disorder, eating disorder, and borderline personality disorder; men were more likely than women to meet criteria for antisocial personality disorder. Additionally, female offenders were found to have a higher degree of internalizing disorders than male offenders, but there were no gender differences in degree of externalizing disorders. The study concluded that women offenders newly admitted to a prison substance abuse program present with a greater psychiatric vulnerability and a different pattern of psychiatric comorbidity than their male counterparts.     

Axis I and II comorbidity in adults with ADHD

Ongoing debate over the validity of the attention-deficit/hyperactivity disorder (ADHD) construct in adulthood is fueled in part by uncertainty regarding implications of potentially extensive yet incompletely described comorbid Axis I and II psychopathology. Three hundred sixty-three adults ages 18 to 37 completed semistructured clinical interviews; informants were also interviewed, and best estimate diagnoses were obtained. Results were as follows: First, ADHD combined type (ADHD-C) had an excess of externalizing and internalizing Axis I disorders, suggesting a gradient-of-severity relationship between it and ADHD inattentive type (ADHD-I). Second, ADHD-C and ADHD-I did not differ in frequency of Axis II disorders. Third, however, ADHD overall was associated with increased rates of Axis II disorders, compared with rates in non-ADHD control participants, including both Cluster B (primarily borderline personality disorder) and Cluster C disorders. Fourth, ADHD incrementally accounted for clinician-rated global assessment of functioning scores above and beyond comorbid conditions or symptoms on either Axis I or Axis II. Results further inform nosology of ADHD in adults.     

Unintentional Injury Risk in Children with Externalizing Behavior Disorders at Summer Camp

Children with externalizing behavior disorders such as attention-deficit/hyperactivity disorder (ADHD), oppositional defiant disorder (ODD), and conduct disorder (CD) have greatly increased risk of unintentional injury, but it is unclear what mechanisms are responsible for that increased risk. This study followed 22 children participating in a summer camp for children with ADHD. Injury incidents were recorded daily and a set of primary symptoms of behavioral disorders were recorded at 15-min intervals over the course of the 6-week summer camp experience (roughly 300 h of observing each child). We predicted symptoms of ODD and CD would be more strongly related to injury incidence than symptoms of ADHD. Results from univariate Poisson regression models confirmed our prediction. Symptoms of ODD and CD—violations and intentional aggression in particular—were related to injury incidence but symptoms of ADHD were not. This finding is consistent with a growing body of evidence that oppositional, noncompliant, and aggressive behavior patterns might be primarily responsible for increased risk for injury among children with externalizing behavior disorders. Thanks to Sylvie Mrug, Peter Winslett, and the other staff members of the STP camp for their cooperation.     

Evidence for a Multi-Dimensional Latent Structural Model of Externalizing Disorders

Strong associations between conduct disorder (CD), antisocial personality disorder (ASPD) and substance use disorders (SUD) seem to reflect a general vulnerability to externalizing behaviors. Recent studies have characterized this vulnerability on a continuous scale, rather than as distinct categories, suggesting that the revision of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) take into account the underlying continuum of externalizing behaviors. However, most of this research has not included measures of disorders that appear in childhood [e.g., attention-deficit/hyperactivity disorder (ADHD) or oppositional defiant disorder (ODD)], nor has it considered the full range of possibilities for the latent structure of externalizing behaviors, particularly factor mixture models, which allow for a latent factor to have both continuous and categorical dimensions. Finally, the majority of prior studies have not tested multidimensional models. Using lifetime diagnoses of externalizing disorders from participants in the Fast Track Project (n?=?715), we analyzed a series of latent variable models ranging from fully continuous factor models to fully categorical mixture models. Continuous models provided the best fit to the observed data and also suggested that a two-factor model of externalizing behavior, defined as (1) ODD+ADHD+CD and (2) SUD with adult antisocial behavior sharing common variance with both factors, was necessary to explain the covariation in externalizing disorders. The two-factor model of externalizing behavior was then replicated using a nationally representative sample drawn from the National Comorbidity Survey-Replication data (n?=?5,692). These results have important implications for the conceptualization of externalizing disorders in DSM-5.     

Understanding the Covariation Among Childhood Externalizing Symptoms: Genetic and Environmental Influences on Conduct Disorder,Attention Deficit Hyperactivity Disorder,and Oppositional Defiant Disorder Symptoms

Conduct disorder (CD), attention deficit hyperactivity disorder (ADHD), and oppositional defiant disorder (ODD) are common childhood externalizing disorders that frequently co-occur. However, the causes of their comorbidity are not well understood. To address that question, we analyzed data from > 600 Finnish twin pairs, who completed standardized interviews at age 14. Behavior genetic methods were used to examine how genetic/environmental factors contribute to each disorders symptoms and to their covariation. We found significant genetic effects on each disorder with only modest evidence of shared environmental influences. Our data suggest the comorbidity among CD, ADHD, and ODD is primarily explained by shared genetic influences; however, each disorder was also under unique genetic influence, supporting the distinction of each disorder.     

Personality heterogeneity in adolescents with disruptive behavior disorders

We first confirmed adolescents diagnosed with disruptive behavior disorders (oppositional defiant, conduct disorder; n = 158) had lower constraint and higher negative emotionality, and greater psychiatric comorbidity and psychosocial dysfunction, relative to adolescents without (n = 755), in a population-based sample enriched for externalizing psychopathology (mean age = 17.90 years; 52% female). We then explored whether different personality types, defined by patterns of personality identified via latent profile analysis, were differently associated with clinical features in adolescents with a disruptive behavior disorder diagnosis. Four distinct personality types (“disinhibited,” “high distress,” “low distress,” “positive”) were meaningfully different from one another. Results highlight personality heterogeneity as a means of identifying individuals at greatest risk for the most deleterious forms of externalizing psychopathology.     

Young adult follow-up of hyperactive children: self-reported psychiatric disorders,comorbidity, and the role of childhood conduct problems and teen CD

We report on the psychiatric disorders present at young adult follow-up (Mean age 20–21 years; 13 + year follow-up) and the comorbidity among them for a large sample of hyperactive (H; N = 147) and community control (CC; N = 71) children. The H group had a significantly higher risk for any nondrug psychiatric disorders than the CC group (59% vs. 36%). More of the H group met criteria for ADHD (5%); major depressive disorder (26%); and histrionic (12%), antisocial (21%), passive–aggressive (18%), and borderline personality disorders (14%) at follow-up than the CC group. Severity of childhood conduct problems contributed to the risk for passive–aggressive, borderline, and antisocial personality disorders. But it only affected risk for antisocial personality after controlling for severity of teen conduct disorder (CD), which also contributed to the risk for these same 3 disorders. Examination for comorbidity among these disorders indicated that presence of either borderline or antisocial personality disorder significantly increased the risk for major depression and the other significant personality disorders. More of the hyperactive group had received various forms of mental health treatment during and since leaving high school than the control group. Results suggest that hyperactive children are at significant risk for at least 1 nondrug disorder in young adulthood, principally major depression and several personality disorders, and that this risk is largely mediated by severity of CD at adolescence.     

Psychiatric Diagnoses and Clinical Characteristics of Asian American Youth in Children's Services

This study examined the psychiatric diagnoses and clinical characteristics of the 981 Asian American children enrolled in the first phase of the Comprehensive Community Mental Health Services for Children and Their Families Program. Asian Americans were less likely than non- Asian Americans to receive diagnoses of depression and ADHD and more likely to receive diagnoses of anxiety and adjustment disorder. As compared to non-Asians, Asian Americans were significantly more likely to be rated with severe functional impairment in community role performance, self-harmful behavior, and thinking. There was also a trend for fewer externalizing behavior problems. Implications for research and practice are discussed.     

Linkages between childhood executive functioning and adolescent social functioning and psychopathology in girls with ADHD

We followed an ethnically and socioeconomically diverse sample of preadolescent girls with ADHD (n = 140) and matched comparison girls (n = 88) over a period of 5 years, from middle childhood through early/midadolescence, with the aim of determining whether childhood levels of executive function (EF) would predict adolescent multi-informant outcomes of social functioning and psychopathology, including comorbidity between externalizing and internalizing symptomatology. Predictors were well-established measures of planning, response inhibition, and working memory, along with a control measure of fine motor control. Independent of ADHD versus comparison group status, (a) childhood planning and response inhibition predicted adolescent social functioning and (b) childhood planning predicted comorbid internalizing/externalizing disorders in adolescence. Subgroup status (ADHD-Combined, ADHD-Inattentive, and comparison) moderated the relationship between childhood planning and adolescent internalizing/externalizing comorbidity, with the combined type revealing particularly strong associations between baseline planning and adolescent comorbidity. Mediation analyses indicated that adolescent social functioning mediated the prediction from childhood EF to comorbidity at follow-up; in turn, in the girls with ADHD, adolescent comorbidity mediated the prediction from childhood EF to social functioning at follow-up. We conclude that childhood interventions should target EF impairments in addition to behavioral symptoms.     

Associations Among Anxiety Disorders and Non-anxiety Disorders,Functional Impairment and Medication in Children and Adolescents

This is a study of comorbid anxiety disorders and how they affect the clinical picture of comorbid cases. The sample consisted of 576 Spanish children aged 8 to 17 years receiving psychiatric outpatient consultation that were evaluated using a semi-structured diagnostic interview for both parents and children. A specific association of homotypic comorbidity among anxiety disorders that was independent of the presence of other disorders was found. There was heterotypic comorbidity between anxiety and depressive disorders, ADHD, anorexia and tic disorders. Relationships between non-anxiety disorders were, in general, independent of anxiety, but anxiety moderated the relationship between ADHD-Conduct disorder and Conduct disorder-enuresis. Comorbid anxiety increased difficulties in social interaction, was related with higher global impairment and had an impact on consultation and medication. Anxiety disorder comorbidity should be well recognized in order not to disregard the treatment of all present disorders.     

Comorbid attention-deficit/hyperactivity disorder in borderline patients defines an impulsive subtype of borderline personality disorder

In order to examine the impulsive profile of a BPD sample with comorbid ADHD, adult patients who met criteria for BPD were assessed for ADHD with the CAADID and the WURS. A high rate of ADHD in the BPD sample was found, with sixty-nine (38.1%) BPD patients diagnosed as having comorbid adult ADHD. BPD-ADHD group had higher rates of general substance use disorder (59.4% vs. 38.4%), antisocial personality disorder (7.2% vs. 0.9%) and obsessive-compulsive personality disorder (21.7% vs. 6.3%). The BPD group without comorbid adult ADHD showed a higher rate of mood disorders (62.5% vs. 37.7%), panic disorders (54.5% vs. 23.1%) and benzodiazepine abuse (18.8% vs. 5.8%). Only in BPD patients without ADHD was comorbid avoidant personality disorder found. BPD patients could be distinguished in two clear subgroups related to the adult ADHD comorbidity. BPD-ADHD patients showed a more homogeneous and impulsive profile while BPD without ADHD comorbidity had more anxiety and depressive disorders.     

Do executive and reactive disinhibition mediate the effects of familial substance use disorders on adolescent externalizing outcomes?

The present study examined the potential mediating roles of executive and reactive disinhibition in predicting conduct problems, attention-deficit/hyperactivity disorder (ADHD) symptoms, and substance use among adolescents with and without a family history of substance use disorders. Using data from 247 high-risk adolescents, parents, and grandparents, structural equation modeling indicated that reactive disinhibition, as measured by sensation seeking, mediated the effect of familial drug use disorders on all facets of the adolescent externalizing spectrum. Executive disinhibition, as measured by response disinhibition, spatial short term memory, and "trait" impulsivity, was associated with ADHD symptoms. Moreover, although executive functioning weakness were unrelated to familial substance use disorders, adolescents with familial alcohol use disorders were at risk for "trait" impulsivity marked by a lack of planning. These results illustrate the importance of "unpacking" the broad temperament style of disinhibition and of studying the processes that underlie the commonality among facets of the externalizing spectrum and processes that predict specific externalizing outcomes.     

Structure and Etiology of Co-occurring Internalizing and Externalizing Disorders in Adolescents

Several studies suggest that a two-factor model positing internalizing and externalizing factors explains the interrelationships among psychiatric disorders. However, it is unclear whether the covariation between internalizing and externalizing disorders is due to common genetic or environmental influences. We examined whether a model positing two latent factors, internalizing and externalizing, explained the interrelationships among six psychiatric disorders (major depressive disorder, generalized anxiety disorder, separation anxiety disorder, attention-deficit/hyperactivity disorder, oppositional defiant disorder, and conduct disorder) in adolescents, and whether there are common genetic and environmental influences on internalizing and externalizing latent factors. Multivariate behavior genetic analyses of data from 1162 twin pairs and 426 siblings ascertained from the general population via the Colorado Center for Antisocial Drug Dependence (CADD) were conducted. We found support for a model positing two latent factors (internalizing and externalizing). These factors were moderately heritable and influenced by significant common genetic and nonshared environmental influences. These findings suggest that co-occurrence of internalizing and externalizing psychopathology in adolescents results from both genetic and environmental influences.     

Diagnostic morbidity and its relationship to severity of ideation for a nonpsychiatric sample of chronic and severe suicide ideators

This study examined the relationships of frequency and type of psychiatric diagnosis to suicidality within a sample of chronically and severely ideating college-aged students (N=78). The most common diagnoses were the depressive disorders, comprising 43% of all diagnoses, followed by anxiety disorders, comprising 17% of all diagnoses. Retrospective reports of childhood diagnoses were also quite common, comprising 38% of all diagnoses. Number of psychiatric diagnoses was significantly correlated with severity of suicidal ideation (r=.27,p<.02). Hierarchical regression analyses revealed that retrospective childhood diagnoses of attention deficit hyperactivity disorder (ADHD) and separation anxiety disorder significantly predicted 19% of the variance in severity of suicidal ideation after controlling for current diagnoses of major depression and PTSD. When entry of childhood and current diagnoses were reversed, PTSD significantly predicted 4% of the variance in severity of suicidal ideation, while major depression was rendered nonsignificant. Severe suicide ideation, therefore, may be a product of early psychological problems as well as the number of such problems.     

Comorbidity of drug abuse treatment

Research has suggested that comorbidity, the concurrence of substance abuse disorders with other psychiatric disorders, may have prognostic value and important implications for the treatment of substance abuse. Knowledge of the prevalence of comorbid disorder is important because it will enable treatment services to be appropriately configured and designed for clinical drug treatment populations. The form and duration of comorbidity may be influenced by a variety of factors, which include the class of drug being abused, the duration of drug use, the individual sensitivity to drug effects, and whether the drug effects are acute or due to withdrawal or residual conditions. This paper addresses three important scientific questions: (1) What is the prevalence of comorbid disorders in a drug abuser population? (2) What is the stability of psychiatric diagnoses in a drug abuser population? (3) Does the existence of a comorbid disorder influence the outcome of drug abuse treatment?     

Examining the impact of psychiatric diagnosis and comorbidity on the medical lethality of adolescent suicide attempts

Specific psychiatric diagnoses and comorbidity patterns were examined to determine if they were related to the medical lethality of suicide attempts among adolescents presenting to an urban general hospital (N=375). Bivariate analysis showed that attempters with substance abuse disorders had higher levels of lethality than attempters without substance abuse. Regression results indicated having depression comorbid with any other diagnosis was not associated with medical lethality. However, having a substance abuse disorder was associated with higher suicide attempt lethality, highlighting the importance of substance abuse as a risk factor for lethal suicide attempts in adolescents. This finding stimulates critical thinking around the understanding of suicidal behavior in youth and the development and implementation of treatment strategies for suicidal adolescents with substance abuse disorders.