Group Treatment for Adults With ADHD Based on a Novel Combination of Cognitive and Dialectical Behavior Interventions: A Feasibility Study

Cognitive emotion regulation and learning effectiveness in college students with ADHD symptoms

BACKGROUND

College students with ADHD have difficulties with emotion regulation and have poorer academic skills than peers without ADHD; however, less is known regarding the relation between ADHD symptoms, maladaptive cognitive emotion regulation strategies (CERS), and learning effectiveness.

OBJECTIVES

We examined whether maladaptive CERS predicted learning effectiveness, and whether this relation was moderated by ADHD symptoms.

DESIGN

A cross-sectional online survey.

METHODS

College students (N = 4,183; Mage = 19.24; 70.1% female) at eight universities completed a battery as part of a larger study.

RESULTS

College students in our elevated ADHD group used significantly more maladaptive CERS and performed worse in three domains of learning effectiveness (i.e., Academic Self-Efficacy [ASE], Organization and Attention to Study [OAS], Stress and Time Press [STP]) than college students in our non-ADHD group. Further, ADHD symptoms moderated the relation between maladaptive CERS and OAS, such that individuals with the highest levels of ADHD symptoms were less impacted by maladaptive CERS.

CONCLUSION

Increased use of maladaptive CERS is unique to ADHD rather than lack of adaptive CERS. Also, maladaptive CERS and low ADHD symptoms interact to predict poor OAS. Interventions for college students, regardless of ADHD status, should incorporate emotion regulation components to improve learning effectiveness.

Experience of CBT in adults with ADHD: a mixed methods study

Introduction

The National Institute for Health and Care Excellence (NICE) recommends Cognitive-Behavioural therapy (CBT) as the psychotherapeutic treatment of choice for adults with Attention Deficit Hyperactivity Disorder (ADHD) in the UK. However, the literature often refers to adapted CBT programs tailored for ADHD and provides limited insight into how adults with ADHD experience and perceive this form of treatment in routine clinical practice.

Methods

This mixed-methods study aims to explore ADHD individuals' experience and perception of CBT delivered in routine clinical practice, to gain a better understanding of this treatment's helpfulness and perceived effectiveness.

Results

A survey (n=46) and semi-structured in-depth interviews (n=10) were conducted to explore the experience of CBT and its perceived effectiveness in managing ADHD. The interviews were analysed using thematic analysis and the survey was synthesised using descriptive narratives. The thematic analysis highlighted three key themes: difficulties with the CBT framework, difficulties with CBT therapists, and consequences of CBT. The survey highlighted similar findings. Participants described the CBT framework as, generic, rigid, and too short, and described the CBT therapist as unspecialised, unempathetic, and not sufficiently adapting CBT to ADHD-related difficulties.

Discussions

Overall, participants found non-adapted, generic CBT in the UK to be unhelpful, overwhelming, and at times harmful to their mental well-being. Therefore, it is necessary for clinical bodies in the UK, while following the indicated NICE guidelines, to be mindful of adapting CBT delivery of CBT, to be most effective for people with ADHD and to mitigate potential harm.

Effectiveness of an online dialectical behavior therapy skills training in adults with attention-deficit/hyperactivity disorder: A randomized controlled trial

OBJECTIVE

The current study aims to examine the efficacy of an add-on dialectical behavior therapy skills training (DBT-ST) on adult attention-deficit/hyperactivity disorder (ADHD). The DBT-ST was applied online under the pandemic conditions that occurred after the study had started.

METHODS

The current randomized controlled trial consists of an intervention group to whom the DBT-ST was applied in online setting and a waitlist control group who received treatment as usual (TAU). Data were collected pre-, post-, and mid-treatment. ADHD symptoms (with the sub-dimensions of inattention and hyperactivity), impulsivity, mindfulness, difficulty with emotion regulation, interpersonal effectiveness, distress tolerance, life satisfaction, functionality in daily life, and general psychological symptom levels were measured with self-report scales. The data were analyzed using mixed-design ANOVA.

RESULTS

The global ADHD, inattention, and hyperactivity symptoms of the DBT-ST group significantly decreased more than those in the TAU control group. The DBT-ST group also showed a significant decrease regarding difficulty with emotion regulation and increases in life satisfaction and functionality, though the group × time effect was not significant.

CONCLUSION

DBT-ST was found effective against the participants' ADHD symptoms. The treatment was additionally found to improve their emotion regulation and quality of life. Further investigation is needed to investigate DBT-ST in an online setting.

A Blended Intervention Targeting Emotion Dysregulation in Adults With Attention-Deficit/Hyperactivity Disorder: Development and Feasibility Study

BACKGROUND

Many adults with attention-deficit/hyperactivity disorder (ADHD) experience difficulties related to emotion regulation. Such difficulties are known to substantially impact quality of life and overall functioning. Yet, there is a lack of treatment interventions specifically designed to address these challenges.

OBJECTIVE

This study aimed to describe the development and assess the feasibility, along with the initial clinical outcomes, of a novel blended intervention for adults with ADHD. The blended intervention combines both face-to-face and digital components and is specifically designed to address emotion dysregulation in ADHD.

METHODS

This intervention was an 8-week blended intervention combining weekly face-to-face group sessions with a supplementary digital companion app. The intervention is based on elements from dialectic behavioral therapy skills training and positive psychology. To evaluate its feasibility, we performed a 10-week feasibility study with an uncontrolled pre-post study design, including 16 adults with ADHD and co-occurring emotion dysregulation. The feasibility measures encompassed adherence, satisfaction, and perceived credibility of the intervention. Clinical outcomes were evaluated by self-reported symptoms of emotion dysregulation, inattention, hyperactivity-impulsivity, executive function, depression, anxiety, and a measure of quality of life. Paired sample 2-tailed t tests were used to analyze clinical outcomes with a Bonferroni-corrected significance level.

RESULTS

Both treatment credibility and treatment satisfaction were rated favorably by the majority of the participants. In particular, the participants emphasized meeting others with ADHD as beneficial. In terms of adherence, 3 participants withdrew before initiating the intervention, while another 4 participants did not complete the intervention. On average, the participants who enrolled in the intervention attended 6.2 of the 8 group sessions and completed 6.7 of the 8 skills training modules in the companion app. In terms of clinical outcomes, there was a reduction in symptoms of emotion dysregulation from before to after the intervention (d=2.0). Significant improvements were also observed in measures of inattention (d=1.1) and hyperactivity-impulsivity (d=0.9). However, no significant improvements were found in the domains of depression, anxiety, quality of life, and executive functioning.

CONCLUSIONS

The results are encouraging, both in terms of feasibility and the preliminary clinical results on emotion dysregulation. The blended format, combining digital and face-to-face elements, may also seem to offer some advantages: the group-based format was valued as it facilitated peer interaction, while a rather high completion of modules in the companion app highlights its potential to enhance skills training between the group sessions. Future randomized controlled trials are called for to further evaluate the clinical effectiveness of the intervention.

TRIAL REGISTRATION

ClinicalTrials.gov NCT05644028; https://clinicaltrials.gov/study/NCT05644028.

Feasibility and Efficacy of Intensive Dialectical Behavior Therapy Skills Training in An Outpatient Setting for A Group of Patients with Extensive Care Needs - A Transdiagnostic Approach

PURPOSE

Dialectical behavior therapy (DBT) is a treatment originally developed för chronically suicidal adults. It is common to adapt it by using one specific component, the DBT skills training (DBT-ST) and apply it in a group therapy setting for a variety of mental disorders. The primary aim of the study was to explore whether patients with extended care needs would report improved mental health after participating in an intensive form of DBT-ST. The secondary aim was to explore whether the use of psychiatric inpatient care for the group would decrease.

METHODS

Thirty-seven participants completed the Clinical Outcomes in Routine Evaluation - Outcome Measure (CORE-OM), and visual analogue scale (VAS) at three time points: pre-intervention, post-intervention and at 6-month follow-up after intensive DBT-ST.

RESULTS

One-way ANOVA showed a significant effect for time on the CORE-OM: F (2,35) = 7.93, p = .001, η2 = 0.312 (large effect size). Post hoc tests indicated a significant difference between pre-intervention and post-intervention (p = .001) and between pre-intervention and follow-up (p = .01). A Friedman test indicated a statistically significant difference in the VAS scale scores across the three time points, with p-values between 0.00 and 0.05. There was no difference in psychiatric healthcare consumption.

CONCLUSION

These study results confirm to some extent the feasibility and effectiveness of the intensive DBT-ST in a transdiagnostic clinical setting. The participants had a positive outcome from the skills training program, but psychiatric healthcare consumption did not decrease.

A Scoping Review of Factors Associated With Emotional Dysregulation in Adults With ADHD

OBJECTIVE

Emotion dysregulation is frequently seen in adults with ADHD and is associated with many adverse outcomes. We conducted a scoping review of factors associated with emotion dysregulation in adults with ADHD.

METHOD

PubMed and PsycInfo (EBSCO) were searched. Articles were included if they measured ADHD, emotional dysregulation or some aspect of emotional dysregulation, and at least one other construct. Studies examining physiological underpinnings as well as clinical trials examining the effect of ADHD medications on emotional dysregulation were excluded because recent reviews have already examined these topics.

RESULTS

Thirty-five studies were included in the review. Factors such as biological sex, comorbidities, attachment style, using certain emotional regulation strategies, and ADHD subtype tend to be related to emotion dysregulation.

CONCLUSION

Clinicians working with adults with ADHD can collect information on these factors to better understand risk for emotion dysregulation, and emotion regulation skills may be one area for intervention.

Internet delivered cognitive behavioral therapy for adults with ADHD - A randomized controlled trial

Evidence-based psychological interventions for adults with attention deficit hyperactivity disorder (ADHD) are seldom available in clinical settings. Medication is often offered as the sole treatment, with non-optimal effects for a majority of patients. The objective was to compare internet-based cognitive behavioral therapy (iCBT) to an active control treatment of internet-based applied relaxation training (iART), and to treatment as usual only (TAU) in adult outpatients with ADHD. One hundred and four patients, of which 67 % used ADHD medication, were randomized to 12 weeks of iCBT (n = 36), iART (n = 37), or TAU (n = 31). Primary outcome was change in the Adult ADHD Self Report Scale (ASRS) up to 3 (FU3) and 12 months (FU12) after treatment. ASRS improved more for iCBT (p < .01; Cohen's d = 0.42 at post-treatment and 0.67 at FU3) and iART (p < .01; Cohen's d = 0.57 at post-treatment and 0.66 at FU3) than for TAU. The effects sustained over 12 months for iCBT (p < .001) and iART (p < .001). No significant difference was found when comparing iCBT to iART (p = .53). Treatment responders reached 25 % for both treatments, which was superior to the 3 % responders in TAU (p < .05). iCBT and iART could both be promising add-ons to medication and increase availability to psychological treatment with sustained symptom reductions after one year.

Group-based emotion regulation skills training for adults with ADHD: A feasibility study in an outpatient psychiatric setting

The aim of this open non-controlled clinical trial was to investigate the feasibility and preliminary treatment effects of a new group-based skills training program for adult ADHD: Group Therapy for Improving Emotional Acceptance and Regulatory Skills in Adults with ADHD (GEARS). Out of the 226 allocated patients, 213 initiated the treatment and 170 (80%) were considered treatment completers (i.e., attending at least 9 out of 14 sessions). A total of 158 of the completers also completed pre- and post-treatment assessments, and 126 provided assessments at the 3-month follow-up. Treatment credibility received high ratings, as did treatment satisfaction. Preliminary treatment effects showed significant improvements in emotion regulation with large effect sizes. Significant effects were also found for all secondary outcome variables: ADHD symptom levels, depression, anxiety, and quality of life. All significant effects remained at the 3-month follow-up. In conclusion, GEARS should be considered a feasible treatment in an outpatient psychiatric setting. The results also indicate that GEARS could be an effective treatment for adults with ADHD who are also experiencing problems with emotion regulation. However, a randomized controlled trial is needed to further evaluate the effectiveness of this new treatment.

Dialectical behavioral therapy-based group treatment versus treatment as usual for adults with attention-deficit hyperactivity disorder: a multicenter randomized controlled trial

BACKGROUND

Studies on structured skills training groups have indicated beneficial, although still inconclusive, effects on core symptoms of ADHD in adults. This trial examined effects of Dialectical Behavioral Therapy-based group treatment (DBT-bGT) on the broader and clinically relevant executive functioning and emotional regulation in adults with ADHD.

METHODS

In a multicenter randomized controlled trial, adult patients with ADHD were randomly assigned to receive either weekly DBT-bGT or treatment as usual (TAU) during 14 weeks. Subsequently, participants receiving TAU were offered DBT-bGT. All were reassessed six months after ended DBT-bGT. Primary outcomes were the Behavior Rating Inventory of Executive Function (BRIEF-A) and the Difficulties in Emotion Regulation Scale (DERS). Secondary outcomes included self-reported ADHD-symptoms, depressive and anxiety symptoms, and quality of life. We used independent samples t- tests to compare the mean difference of change from pre- to post-treatment between the two treatment groups, and univariate linear models adjusting for differences between sites.

RESULTS

In total, 121 participants (68 females), mean age 37 years, from seven outpatient clinics were included, of whom 104 (86%) completed the 14-week trial. Entering the study, 63% used medication for ADHD. Compared to TAU (n = 54), patients initially completing DBT-bGT (n = 50) had a significantly larger mean reduction on the BRIEF-A (-12.8 versus -0.37, P = 0.005, effect size 0.64), and all secondary outcomes, except for symptoms of anxiety. All significant improvements persisted at 6 months follow-up. Change on DERS did not differ significantly between the groups after 14 weeks, but scores continued to decrease between end of group-treatment and follow-up.

CONCLUSIONS

This DBT-bGT was superior to TAU in reducing executive dysfunction, core symptoms of ADHD and in improving quality of life in adults with ADHD. Improvements sustained six months after ended treatment. The feasibility and results of this study provide evidence for this group treatment as a suitable non-pharmacological treatment option for adults with ADHD in ordinary clinical settings.

TRIAL REGISTRATIONS

The study was pre-registered in the ISRCTN registry (identification number ISRCTN30469893, date February 19^th 2016) and at the ClinicalTrials.gov (ID: NCT02685254, date February 18^th 2016).

ADHD Symptoms as a Stressor Leading to Depressive Symptoms among University Students: The Mediating Role of Perceived Stress between ADHD and Depression

Attention deficit hyperactivity disorder (ADHD) is a condition manifested in childhood and includes symptoms, such as attention deficit, impulsivity, difficulty in concentrating, hyperactivity, and aggressive behavior. Along with the negative effects of ADHD symptoms on individuals, various psychological factors are thought to be associated with these symptoms. However, ADHD in emerging adulthood is not rare and can be conceived as the continuation of discomfort that might emerge during childhood and adolescence. Our mediation study involved 613 undergraduate students in İstanbul. The participants filled out demographic information forms: Adult Attention Deficit and Hyperactivity Disorder Self-Reported Scale (ASRS), Perceived Stress Scale and Beck Depression Inventory (BDI). Our work stressed those positive correlations found among ASRS, Perceived Stress Scale, and BDI scores. Analysis by Model 4 of Hayes Process Macro and Sobel tests showed that ADHD symptoms predicted both perceived stress and depression scores of the participants and dimensions of perceived stress acted as partial mediators in the positive relationship between ADHD and depression scores.

Characteristics of inpatients in dialectical behaviour therapy modified for a resource-limited setting

Background

Aim

Setting

Methods

Results

Conclusions

Effects and clinical feasibility of a behavioral treatment for sleep problems in adult attention deficit hyperactivity disorder (ADHD): a pragmatic within-group pilot evaluation

BACKGROUND

Sleep disturbances, including insomnia, are common in adult Attention Deficit Hyperactivity Disorder (ADHD). Treatment of choice for insomnia is cognitive behavioral therapy (CBT-i), but evidence is lacking for CBT-i in patients with ADHD. The purpose of this study was to investigate if patients with insomnia and other sleep problems, at a specialist clinic for ADHD, benefit from a group delivered behavioral treatment based on CBT-i; whether insomnia severity improves following this treatment.

METHODS

This pragmatic within-group pilot study with a pre to post and three-month follow-up design was set at a specialist psychiatric out-patient clinic for adult ADHD. As an adjunct to care-as-usual at the clinic, a CBT-i-based group treatment targeting several sleep problems prevalent in the ADHD-population, was offered as 10 weekly 90-min group sessions and scheduled telephone support. All outcome measures were subjectively reported by participants. Data analyzed with dependent t-tests according to intent-to-treat.

RESULTS

Nineteen patients (37 [SD 13.7] years; 68% female) with ADHD and subjectively reported sleep problems provided informed consent and pre-treatment measures. Patients had suffered from sleep problems for 15.3 [SD 13.4] years, 42% used sleep medications, 79% used stimulant medication(s). At post-treatment, insomnia severity (Insomnia Severity Index; score range 0-28) had improved with 4.5 points (95% CI, 2.06-6.99, p = .002), at 3 months with 6.8 points (95% CI, 4.71-8.91, p < .0001) from pre-treatment.

CONCLUSIONS

CBT-i adjusted for ADHD is promising for improving insomnia severity in adult patients at specialist psychiatric out-patient clinics, who suffer from ADHD and sleep disturbances.

TRIAL REGISTRATION

Study registered with the Regional ethical review board in Stockholm, January 13th 2016, Study id: 2015/2078-31/1. Study registered retrospectively with Clinicaltrials.org, February 21st 2019, ID: NCT03852966.

Long-term Effects of Multimodal Treatment on Adult Attention-Deficit/Hyperactivity Disorder Symptoms: Follow-up Analysis of the COMPAS Trial

IMPORTANCE

Knowledge about the long-term effects of multimodal treatment in adult attention-deficit/hyperactivity disorder (ADHD) is much needed.

OBJECTIVE

To evaluate the long-term efficacy of multimodal treatment for adult ADHD.

DESIGN, SETTING, AND PARTICIPANTS

This observer-masked, 1.5-year follow-up of the Comparison of Methylphenidate and Psychotherapy in Adult ADHD Study (COMPAS), a prospective, multicenter randomized clinical trial, compared cognitive behavioral group psychotherapy (GPT) with individual clinical management (CM) and methylphenidate (MPH) with placebo (2 × 2 factorial design). Recruitment started January 2007 and ended August 2010, and treatments were finalized in August 2011 with follow-up through March 2013. Overall, 433 adults with ADHD participated in the trial, and 256 (59.1%) participated in the follow-up assessment. Analysis began in November 2013 and was completed in February 2018.

INTERVENTIONS

After 1-year treatment with GPT or CM and MPH or placebo, no further treatment restrictions were imposed.

MAIN OUTCOMES AND MEASURES

The primary outcome was change in the observer-masked ADHD Index of Conners Adult ADHD Rating Scale score from baseline to follow-up. Secondary outcomes included further ADHD rating scale scores, observer-masked ratings of the Clinical Global Impression scale, and self-ratings of depression on the Beck Depression Inventory.

RESULTS

At follow-up, 256 of 433 randomized patients (baseline measured in 419 individuals) participated. Of the 256 patients participating in follow-up, the observer-masked ADHD Index of Conners Adult ADHD Rating Scale score was assessed for 251; the mean (SD) baseline age was 36.3 (10.1) years; 125 patients (49.8%) were men; and the sample was well-balanced with respect to prior randomization (GPT and MPH: 64 of 107; GPT and placebo: 67 of 109; CM and MPH: 70 of 110; and CM and placebo: 55 of 107). At baseline, the all-group mean ADHD Index of Conners Adult ADHD Rating Scale score was 20.6, which improved to adjusted means of 14.2 for the GPT arm and 14.7 for the CM arm at follow-up with no significant difference between groups (difference, -0.5; 95% CI, -1.9 to 0.9; P = .48). The adjusted mean decreased to 13.8 for the MPH arm and 15.2 for the placebo arm (difference, -1.4; 95% CI, -2.8 to -0.1; P = .04). As in the core study, MPH was associated with a larger reduction in symptoms than placebo at follow-up. These results remained unchanged when accounting for MPH intake at follow-up. Compared with participants in the CM arm, patients who participated in group psychotherapy were associated with less severe symptoms as measured by the self-reported ADHD Symptoms Total Score according to the Diagnostic and Statistical Manual of Mental Disorders (Fourth Edition) (DSM-IV) of Conners Adult ADHD Rating Scale (AMD, -2.1; 95% CI, -4.2 to -0.1; P = .04) and in the subscale of reducing pure hyperactive symptoms, measured via the Diagnostic Checklist for the diagnosis of ADHD in adults (AMD, -1.3; 95% CI, -2.8 to 0.1; P = .08). Regarding the Clinical Global Impression scale assessment of effectiveness, the difference between GPT and CM remained significant at follow-up (odds ratio, 1.63; 95% CI, 1.03-2.59; P = .04). No differences were found for any comparison concerning depression as measured with the Beck Depression Inventory.

CONCLUSIONS AND RELEVANCE

Results from COMPAS demonstrate a maintained improvement in ADHD symptoms for adults 1.5 years after the end of a 52-week controlled multimodal treatment period. The results indicate that MPH treatment combined with GPT or CM provides a benefit lasting 1.5 years. Confirming the results of the core study, GPT was not associated with better results regarding the primary outcome compared with CM.

TRIAL REGISTRATION

isrctn.org Identifier: ISRCTN54096201.

Practitioner Review: Emotional dysregulation in attention-deficit/hyperactivity disorder - implications for clinical recognition and intervention

BACKGROUND

Because emotional symptoms are common in attention-deficit/hyperactivity disorder (ADHD) patients and associate with much morbidity, some consider it to be a core feature rather than an associated trait. Others argue that emotional symptoms are too nonspecific for use as diagnostic criteria. This debate has been difficult to resolve due, in part, to the many terms used to describe emotional symptoms in ADHD and to concerns about overlap with mood disorders.

METHODS

We sought to clarify the nature of emotional symptoms in ADHD by reviewing conceptual and measurement issues and by examining the evidence base regarding specificity of such symptoms for ADHD. We reviewed the various terms used to define emotional symptoms in ADHD, clarify how these symptoms are demarcated from mood disorders, and assess the possibility that symptoms of emotional impulsivity and deficient emotional self-regulation should be considered as core symptoms. We addressed psychiatric comorbidities, the effects of ADHD treatments on associated emotional dysregulation, and the utility of current rating scales to assess emotional symptoms associated with ADHD.

RESULTS

Emotional symptoms are common and persistent in youth and adults with ADHD. Although emotional symptoms are common in other psychiatric disorders, emotional impulsivity (EI), and deficient emotional self-regulation (DESR) may be sufficiently specific for ADHD to function as diagnostic criteria.

CONCLUSIONS

Emotional symptoms in ADHD cause clinically significant impairments. Although there is a solid theoretical rationale for considering EI and DESR to be core symptoms of ADHD, there is no consensus about how to define these constructs sin a manner that would be specific to the disorder. An instrument to measure EI and DESR which demarcates them from irritability and other emotional symptoms could improve the accuracy of diagnostic criteria for ADHD.

Identifying novel applications of dialectical behavior therapy: considering emotion regulation and parenting

Dialectical behavior therapy (DBT) is an effective treatment for an increasing number of mental disorders. Its increased application to a range of disorders has been prompted by the recognition that DBT targets emotion dysregulation, which is a transdiagnostic feature underlying several forms of psychopathology. More recently, DBT has been used to target additional clinically relevant domains that are outside diagnostically bound categories, such as improving parenting quality as a means of preventing psychopathology in children of parents with psychopathology. As the ability to regulate emotions is critical to parenting, this paper uses the connection between DBT, emotion regulation, and parenting as an illustration of how focusing on mechanistic features by which DBT is effective aids in strategically identifying areas by which DBT may be a highly useful treatment option.

Long-Term Efficacy of Psychosocial Treatments for Adults With Attention-Deficit/Hyperactivity Disorder: A Meta-Analytic Review

Background: Recent evidence suggests that psychosocial treatments, particularly cognitive-behavioral therapy (CBT), are effective interventions for adult attention deficit hyperactivity disorder (ADHD). The objective of this review was to determine the long-term efficacy of psychosocial interventions in improving clinically relevant variables, including ADHD core symptoms, clinical global impression (CGI), and global functioning. Methods: In total, nine randomized controlled trials and three uncontrolled single-group pretest-posttest studies were included. The data from these studies were combined using the inverse variance method. Heterogeneity and risk of bias were assessed. Subgroup analyses and meta-regressions were performed, to determine the influence of different potential moderator variables (risk of bias, medication status, follow-up length, therapy type and setting, and control group type) on effect size (ES) estimates. Results: Up to 680 of a total of 1,073 participants assessed pre-treatment were retained at follow-up. Treatment groups showed greater improvement than control groups in self-reported total ADHD symptoms, inattention, and hyperactivity/impulsivity, in addition to CGI and global functioning. Blind assessors also reported a large ES in within-subject outcomes. Studies using dialectical behavioral therapy (DBT) in a group setting, with active control matching, and that were rated as having an unclear risk of bias, achieved significantly lower ES estimates for most outcomes. Treatment effectiveness, according to the CGI measure, and global functioning were significantly increased when the percentage of medicated participants was greater. Conclusions: Our results indicate that the post-treatment gains reported in previous reviews are sustained for at least 12 months. Nevertheless, these results must be interpreted with caution, because of a high level of heterogeneity among studies and the risk of bias observed in the majority of outcomes. Thus, these findings indicate that psychological interventions are a highly valuable and stable clinical tool for the treatment of core symptoms and global functioning in adults with ADHD.