The impact of obsessive-compulsive personality disorder in perfectionism.

OBJECTIVE: The construct of perfectionism has long been related to Obsessive-Compulsive Personality Disorder (OCPD), though research has not considered how OCPD could distinguish individuals with elevated perfectionism. The aim of this study was to evaluate clinical differences between those with and without OCPD in a sample of individuals with elevated perfectionism. METHODS: Seventy-four university students with elevated perfectionism completed a diagnostic assessment and several self-report measures of clinical characteristics and were randomly assigned to complete an exposure-based treatment for perfectionism or waitlist. Thirty-four (45.95%) participants met DSM-IV diagnostic criteria for OCPD. RESULTS: Compared to those without OCPD, individuals with OCPD had higher levels of general and specific domains of perfectionism and higher levels of social anxiety. OCPD diagnosis was also associated with higher rates of current anxiety disorder. Importantly, those with and without OCPD showed comparable benefits from treatment. CONCLUSIONS: This study provides novel evidence of the role of OCPD in perfectionism and demonstrates the efficacy of a perfectionism-oriented treatment in individuals with OCPD.Key pointsWe examined the role of obsessive-compulsive personality disorder (OCPD) in a high perfectionism sample.OCPD was associated with higher perfectionism and personal standards.OCPD was also associated with higher social anxiety and higher rates of current anxiety disorder.Those with and without OCPD had comparable responses to an exposure-based treatment for perfectionism.

Problematic internet use: an exploration of associations between cognition and COMT rs4818, rs4680 haplotypes.

OBJECTIVE: Problematic internet users suffer from impairment in a variety of cognitive domains. Research suggests that COMT haplotypes exert differential effects on cognition. We sought to investigate differences in the genetic profiles of problematic internet users and whether those could shed light on potential cognitive differences. METHODS: We recruited 206 non-treatment seeking participants with heightened impulsive traits and obtained cross-sectional demographic, clinical, and cognitive data as well as the genetic haplotypes of COMT rs4680 and rs4818. We identified 24 participants who presented with problematic internet use (PIU) and compared PIU and non-PIU participants using one-way analysis of variance (ANOVA) and chi square as appropriate. RESULTS: PIU was associated with worse performance on decision making, rapid visual processing, and spatial working memory tasks. Genetic variants were associated with altered cognitive performance, but rates of PIU did not statistically differ for particular haplotypes of COMT. CONCLUSION: This study indicates that PIU is characterized by deficits in decision making and working memory domains; it also provides evidence for elevated impulsive responses and impaired target detection on a sustained attention task, which is a novel area worth exploring further in future work. The effects observed in the genetic influences on cognition of PIU subjects imply that the genetic heritable components of PIU may not lie within the genetic loci influencing COMT function and cognitive performance; or that the genetic component in PIU involves many genetic polymorphisms each conferring only a small effect.

Milk Thistle Treatment for Children and Adults with Trichotillomania: A Double-Blind, Placebo-Controlled, Crossover Negative Study.

BACKGROUND: Data on the pharmacological treatment of trichotillomania are limited. Milk thistle has antioxidant properties and showed promise in trichotillomania in a prior case report. The goal of the current study was to determine the efficacy and tolerability of silymarin in children and adults with trichotillomania. METHODS: Twenty individuals (19 [95.0%] women; 16 adults; mean age, 27.9 [11.5] years) with trichotillomania entered a 12-week, double-blind, placebo-controlled crossover study (6 weeks of milk thistle and 6 weeks of placebo with a 1-week wash-out in between). Dosing of milk thistle ranged from 150 mg twice a day to 300 mg twice a day. Subjects were assessed with the National Institute of Mental Health Trichotillomania Severity Scale (primary outcome), the Massachusetts General Hospital Hair Pulling Scale, Clinical Global Impression scale, and measures of depression, anxiety, and psychosocial functioning. Outcomes were examined using linear mixed models with a random intercept for subject and t tests. RESULTS: There were no statistically significant treatment type-by-time interactions for the main outcome measure, but significant effects were seen for secondary measures (eg, time spent pulling per day for the past week). From baseline to week 6, there was a significant decrease in Clinical Global Impression severity for the milk thistle group but not in the placebo group. CONCLUSIONS: This trial failed to show that milk thistle was more effective than placebo on the main outcome measure, but milk thistle did demonstrate significant improvements on select secondary outcome measures. These findings may shed light on important neurochemical targets worthy of future investigation.

A double-blind, placebo-controlled study of vortioxetine in the treatment of binge-eating disorder.

BACKGROUND: Binge-eating disorder (BED) is associated with impaired quality of life and has a number of untoward public health associations. There are few established pharmacological treatments for BED, and available options are not suitable for all individuals. Vortioxetine is a recently developed pharmacological agent with effects on the serotonergic but also other neurochemical systems, which has yet to be evaluated in this context. METHOD: Eighty adults with BED were recruited for a double-blind, placebo-controlled study. Participants received 12-week treatment with vortioxetine (10 mg/day for 1 week, then increasing to 20 mg/day) or placebo in a parallel design. The primary efficacy outcome measures were binge-eating frequency and weight. Safety data were collected. Effects of active versus placebo treatment were characterized using linear repeated measures models. RESULTS: Both vortioxetine and placebo treatment were associated with significant reductions in binge-eating frequency. Vortioxetine did not differentiate significantly from placebo on any efficacy measure. Frequency of adverse events did not differ between groups. DISCUSSION: Vortioxetine was not more effective than placebo in the treatment of BED. The ability to detect pharmacological treatment benefit may have been hindered by the relatively high placebo response and drop out. Future work should seek to better understand and predict placebo response in BED, with a view to more targeted treatment interventions and, potentially, sample enrichment.

Gambling and its clinical correlates in university students.

OBJECTIVE: This study sought to examine the prevalence of gambling disorder (GD) in a university sample and its associated physical and mental health correlates. METHODS: A 156-item anonymous online survey was distributed via random email generation to a sample of 9449 university students. Current use of alcohol and drugs, psychological and physical status and academic performance were assessed, along with questionnaire-based measures of impulsivity and compulsivity. Positive screens for GD were based upon individuals meeting DSM-5 criteria. RESULTS: A total of 3421 participants (59.7% female) were included in the analysis. The overall prevalence of GD was 0.4%, while an additional 8.4% reported subsyndromal symptoms of GD. GD was significantly associated with past-year use of cocaine, heroin/opiate pain medications, sedatives, alcohol and tobacco. Those with GD were more likely to have generalized anxiety, PTSD and compulsive sexual behavior. Questionnaire-based measures revealed higher levels of both compulsivity and impulsivity associated with disordered gambling. CONCLUSIONS: Some level of gambling symptomatology is common in young adults and is associated with alcohol and drug use, as well as impulsive and compulsive behaviors. Clinicians should be aware of the presentation of problematic gambling and screen for it in primary care and mental health settings.

Neuroanatomical Correlates of Impulsive Action in Excoriation (Skin-Picking) Disorder.

Excoriation (skin-picking) disorder (SPD) has similarities to obsessive-compulsive disorder (OCD) and is included within the obsessive-compulsive and related disorders (OCRD) diagnostic class in DSM-5. Separate neuroimaging and neurocognitive studies suggest that people affected by SPD find it difficult to inhibit dominant motor responses due to a failure of "top-down" control mechanisms. No study has examined the neural correlates of SPD in participants with varying degrees of impulsive motor behavior. This study correlated cortical thickness and volumes of selected subcortical structures with stop-signal task performance in participants with SPD (N=15) and in healthy control subjects (N=8). All participants were free from current psychiatric comorbidity, including OCD. In volunteers with SPD, longer stop-signal reaction times were correlated with cortical thinning in the right insula and right-inferior parietal lobe and with increased cortical thickness in the left-lateral occipital lobe, though these findings did not withstand correction for multiple comparisons. There were no significant correlations between cortical thickness in these three structures and stop-signal reaction times in the control group. This study suggests that structural abnormalities in the insular cortex and parietal and occipital regions may play a role in the pathophysiology of SPD. Further neuroimaging research is needed to understand the neurobiology of SPD and its relationship with other putative OCRDs.

Age at first sexual activity: Clinical and cognitive associations.

BACKGROUND: Engagement in sexual activity is common among adolescents and can be considered part of adolescent development, but it carries potential life-changing consequences. METHODS: This study examined if clinical and cognitive differences existed between adolescents who engaged in voluntary sexual behavior before age 15, between ages 15 to 18, and after age 18. All participants were part of a larger study examining impulsive behavior in young adults. Participants were assessed on measures including demographics, comorbid psychiatric disorders, and clinical scales and cognitive tasks assessing impulsivity, obsessive-compulsive traits, emotion regulation, depression, anxiety, and quality of life. RESULTS: Those who engaged in voluntary sexual activity before age 15 were more likely to have increased depression and anxiety symptoms, to score higher on the Yale Brown Obsessive-Compulsive Scale for Pathologic Gambling, and to make poorer decisions on the Cambridge Gambling Task. CONCLUSIONS: The results of this study suggest that the decision to engage in sexual activity at a young age is not an act of thinking before acting or impatience, but rather a decision to engage in sensation-seeking behavior. This finding carries implications for interventions targeting healthy sexual activity in adolescents.

Stealing behavior and impulsivity in individuals with kleptomania who have been arrested for shoplifting.

OBJECTIVES: Kleptomania is characterized by strong urges to steal and is one of only a few psychiatric disorders defined by illegal behaviors, but the clinical characteristics of individuals with kleptomania who have faced legal consequences due to their behavior are poorly understood. METHOD: From 2001 to 2012, we recruited 107 adult participants with DSM-IV kleptomania. Participants with a history of shoplifting-related arrest (N=82) were compared with those who had no such history (N=25) on demographics, clinical features, and a self-report measure of impulsivity. RESULTS: Participants whose shoplifting had resulted in arrest had higher self-rated impulsivity on a weak trend level (Eysenck Impulsiveness Questionnaire), with large to very large effect size (Cohen's d=1.12). Group comparisons showed no significant differences in terms of overall functioning (d=0.60), time spent stealing (d=0.73), frequency of stealing behavior (d=0.33), psychiatric comorbidity, or severity of kleptomania symptoms. CONCLUSIONS: Legal problems in kleptomania may be associated with generalized deficits in inhibitory control independent of kleptomania symptom severity. These findings emphasize the need for treatment to improve functional status in individuals with kleptomania and reduce the social and economic costs associated with reoffending.

Prescription opioid medication misuse among university students.

BACKGROUND AND OBJECTIVES: Prescription opioid misuse is an established problem in the United States. Less information is known regarding the clinical and cognitive characteristics of prescription opioid misusers, specifically in a college age population. This study sought to characterize individuals who misuse prescription opioids and the differences between current, past and non-misusers. METHODS: A 156-item survey was administered to over 9,449 university students at a large, public Midwestern university. Survey questions obtained demographic information, self-reported grade point average, sexual behavior, mental health characteristics, and substance use. Participants also completed assessments that asked questions regarding impulsivity, mental health, substance use, and other impulsive behaviors including gambling and sexual activity. 3,522 students completed the survey and were included in the analysis. RESULTS: Of this group, 2.2% reported misusing prescription opioids in the last 12 months and another 5.3% reported misusing prescription opioids previously but not in the past year. This study found prescription opioid misusers to be more likely to live off campus, have a lower GPA, and exhibit increased impulsivity. Prescription opioid misusers were also more likely to report earlier age of sexual activity and were less likely to use barrier protection during sexual activity. CONCLUSIONS AND SCIENTIFIC SIGNIFICANCE: This study identifies a number of risk factors for those misusing prescription opioids that can be used to develop and refine prescription opioid misuse screening tools for university health centers. It also identifies a number of concurring behaviors that can simultaneously be addressed when prescription opioid misusers are identified. (Am J Addict 2018;XX:1-7).

An Analysis of Treatment-Seeking Behavior in Individuals with Gambling Disorder.

Gambling disorder affects approximately 1.1-3.5% of the population, with the rates being higher in young adults. Despite this high prevalence, little is known regarding which pathological gamblers decide to seek treatment. This study sought to examine the differences in three groups of pathological gamblers: those who did not seek treatment (n = 94), those who sought therapy (n = 106) and those who sought medication therapy (n = 680). All subjects were assessed on a variety of measures including demographics, family history, gambling history, comorbid psychiatric disorders and an assortment of clinical variables such as the Quality of Life Inventory, Hamilton Depression and Anxiety Rating Scales, Yale Brown Obsessive Compulsive Scale for Pathologic Gambling (PG-YBOCS), Barratt Impulsiveness Scale, Eysenck Impulsiveness Questionnaire and select cognitive tasks. Those seeking treatment were more likely to be Caucasian, have lost more money in the past year due to gambling, and were more likely to have legal and social problems as a result of their gambling. Those seeking therapy or medical treatment also scored significantly higher on the PG-YBOCS. This study suggests that pathologic gamblers seeking treatment were more likely to exhibit obsessive-compulsive tendencies likely leading to the increased legal and social problems that exist in this group.

Neurocognitive Functioning in Young Adults with Subclinical Body Dysmorphic Disorder.

Despite reasonable knowledge of body dysmorphic disorder (BDD), little is known of its cognitive antecedents. In this study, we evaluated executive functioning and decision-making in people at risk of developing BDD using neuropsychological tests. Participants were non-treatment seeking volunteers (18-29 years) recruited from the general community, and split into two groups: those "at risk" of developing BDD (N = 5) and controls (N = 82). Participants undertook the One-Touch Stockings of Cambridge, Cambridge Gamble and Spatial Working Memory tasks and were assessed with the Body Dysmorphic Disorder Questionnaire. Results showed that the at-risk subjects performed significantly worse on a measure of executive function, whereas measures of risk-seeking behavior, quality of decision-making, and spatial working memory were largely intact. The findings suggest that selective cognitive dysfunction may already be present in terms of executive functioning in those at risk of developing BDD, even before psychopathology arises.

Impact of obsessive-compulsive personality disorder symptoms in Internet users.

BACKGROUND: Internet use is pervasive in many cultures. Little is known about the impact of obsessive-compulsive personality disorder (OCPD) symptoms on impulsive and compulsive psychopathologies in people who use the Internet. METHODS: Adult Internet users (N = 1,323) completed an online questionnaire quantifying OCPD symptoms, likely occurrence of select mental disorders (obsessive-compulsive disorder, attention-deficit/hyperactivity disorder [ADHD], problematic Internet use, generalized anxiety disorder), and personality questionnaires of impulsivity and compulsivity. Predictors of the presence of OCPD symptoms (endorsement of at least 4 of 8 DSM-5 criteria) were identified using binary logistic regression. RESULTS: In regression (P < .001, area under the curve, 0.77), OCPD symptoms were significantly associated with (in order of decreasing effect size) lower non-planning impulsivity, higher ADHD symptoms, problematic Internet use, avoidant personality disorder, female sex, generalized anxiety disorder, and some types of compulsions (checking, dressing/washing). CONCLUSIONS: These data suggest that OCPD symptoms, defined in terms of at least 4 of 8 DSM criteria being met, are common in Internet users. OCPD symptoms were associated with considerably higher levels of psychopathology relating to both impulsive (ADHD) and compulsive (OCD-related and problematic Internet use) disorders. These data merit replication and extension using standard in-person clinical assessments, because the current study relied on self-report over the Internet.

Problematic internet use in gamblers: impact on clinical and cognitive measures.

OBJECTIVE: Gambling is a commonplace phenomenon, existing along a continuum from occasional gambling to functionally impairing gambling disorder. The internet may act as a conduit for some gambling behaviors. The impact of problematic internet use on clinical and cognitive features relevant to gambling has received little research attention. METHODS: A total of 206 adults aged 18-30 years who gamble at least five times per year were recruited from the general community and undertook detailed clinical and cognitive assessments. Problematic internet use was defined using a total score of 5 or more on Young's Diagnostic Questionnaire (YDQ). Linear regression was employed to evaluate the relative contribution of addictive-related, impulsive-related, and compulsive-related measures in predicting YDQ total scores in gamblers. RESULTS: Gamblers with problematic internet use (18% of the sample) reported lower quality of life, lower self-esteem, elevated rates of intermittent explosive disorder, gambling disorder symptoms, attention deficit hyperactivity disorder (ADHD) symptoms, antisocial personality disorder, and posttraumatic stress disorder (PTSD), as well as relative deficits in decision making and spatial working memory. In linear regression, the extent of problematic internet use was most significantly associated with increased gambling disorder symptoms and increased ADHD symptoms. CONCLUSIONS: Problematic internet use in gamblers is associated with worse quality of life, more problem/pathological gambling symptoms, more psychiatric morbidities, and select cognitive impairment. Refinement of the definition of problematic internet use and exploration of its clinical and cognitive associations are likely to be highly relevant to the treatment of problematic gambling.

ADHD symptoms in non-treatment seeking young adults: relationship with other forms of impulsivity.

OBJECTIVE: Attention-deficit hyperactivity disorder (ADHD) has been associated with various manifestations of impulsivity in adults, including elevated rates of other impulsive disorders, substance use, questionnaire-based impulsivity scores, and inhibitory dysregulation on neurocognitive tests. The relationship between ADHD and all these other forms of impulsivity has yet to be explored within the context of a single comprehensive study. METHODS: A total of 423 young adults, who gambled ≥5 times in the preceding year, were recruited using media advertisements and undertook detailed assessment including structured psychiatric interview, questionnaires, and neurocognitive tests. Participants with ADHD symptoms were identified using the Adult ADHD Self-Report Scale Screener (ASRS-V1.1) and were compared to controls using multivariate analysis of variance (MANOVA). RESULTS: ADHD symptoms were found in 20.3% of the sample, but only 7.3% of these subjects had ever received a formal diagnosis. ADHD symptoms were associated with significantly lower quality of life, lower self-esteem, higher emotional dysregulation, higher impulsivity questionnaire scores, more problematic Internet use, greater occurrence of psychiatric disorders, and impaired stop-signal reaction times. Of these variables, stop-signal reaction times and Barratt attentional impulsiveness were the strongest predictors of group classification. CONCLUSIONS: ADHD symptoms are common and under-diagnosed in young adults who gamble, and are most strongly linked with certain other types of impulsivity (questionnaire- and cognitive-based measures) and with emotional dysregulation, suggesting that these are each important considerations in understanding the pathophysiology of the disorder, but also potential treatment targets. It is necessary to question whether treatment for adult ADHD could be enhanced by considering self-esteem, emotional reactivity, and impaired inhibitory control as specific treatment targets, in addition to the core diagnostic symptoms of the disorder.

Trichotillomania and co-occurring anxiety.

BACKGROUND: Trichotillomania appears to be a fairly common disorder, with high rates of co-occurring anxiety disorders. Many individuals with trichotillomania also report that pulling worsens during periods of increased anxiety. Even with these clinical links to anxiety, little research has explored whether trichotillomania with co-occurring anxiety is a meaningful subtype. METHODS: One hundred sixty-five adults with trichotillomania were examined on a variety of clinical measures including symptom severity, functioning, and comorbidity. Participants also underwent cognitive testing assessing motor inhibition and cognitive flexibility. Clinical features and cognitive functioning were compared between those with current co-occurring anxiety disorders (i.e. social anxiety, generalized anxiety disorder, panic disorder, and anxiety disorder NOS) (n=38) and those with no anxiety disorder (n=127). RESULTS: Participants with trichotillomania and co-occurring anxiety reported significantly worse hair pulling symptoms, were more likely to have co-occurring depression, and were more likely to have a first-degree relative with obsessive compulsive disorder. Those with anxiety disorders also exhibited significantly worse motor inhibitory performance on a task of motor inhibition (stop-signal task). CONCLUSIONS: This study suggests that anxiety disorders affect the clinical presentation of hair pulling behavior. Further research is needed to validate our findings and to consider whether treatments should be specially tailored differently for adults with trichotillomania who have co-occurring anxiety disorders, or more pronounced cognitive impairment.

Predictors of comorbid eating disorders and association with other obsessive-compulsive spectrum disorders in trichotillomania.

Trichotillomania (TTM) and eating disorders (ED) share many phenomenological similarities, including ritualized compulsive behaviors. Given this, and that comorbid EDs may represent additional functional burden to hair pullers, we sought to identify factors that predict diagnosis of an ED in a TTM population. Subjects included 555 adult females (age range 18-65) with DSM-IV-TR TTM or chronic hair pullers recruited from multiple sites. 7.2% (N=40) of our TTM subjects met criteria for an ED in their lifetime. In univariable regression analysis, obsessive-compulsive disorder (OCD), Yale-Brown Obsessive Compulsive Scale (Y-BOCS) worst-ever compulsion and total scores, certain obsessive-compulsive spectrum disorders, anxiety disorder, attention-deficit/hyperactivity disorder (ADHD), and substance disorder all met the pre-specified criteria for inclusion in the multivariable analysis. In the final multivariable model, diagnosis of OCD (OR: 5.68, 95% CI: 2.2-15.0) and diagnosis of an additional body-focused repetitive behavior disorder (BFRB) (OR: 2.69, 95% CI: 1.1-6.8) were both associated with increased risk of ED in TTM. Overall, our results provide further support of the relatedness between ED and TTM. This finding highlights the importance of assessing for comorbid OCD and additional BFRBs in those with TTM. Future research is needed to identify additional predictors of comorbid disorders and to better understand the complex relationships between BFRBs, OCD and EDs.

Sub-clinical Alcohol Consumption and Gambling Disorder.

While it is well established that gambling disorder is associated with alcohol use disorder, less is known regarding whether sub-clinical alcohol consumption increases gambling behavior. This study examined the effects of varying levels of alcohol consumption on clinical and cognitive measures. The sample consisted of 572 non-treatment seeking gamblers age 18-29 who were divided into three groups: non-current drinkers, current drinkers who did not qualify for an alcohol use disorder, and those with an alcohol use disorder (AUD). All subjects were assessed on gambling pathology, severity and impulsivity using the Structured Clinical Interview for Gambling Disorder, Yale Brown Obsessive Compulsive Scale for Pathologic Gambling and the Barratt Impulsive Scale-11 and select cognitive tests. In all of the clinical measures, controlling for age, gender and education, the AUD group was significantly more likely than the non-current and current drinkers to be a pathologic gambler and to be impulsive, compulsive and depressed. On cognitive tasks, controlling for age, gender and education, the AUD group had significantly worse strategy use on a spatial working memory task than both other groups. This study suggests that the relationship between alcohol and gambling may only exist when pathology in both alcohol consumption and gambling behavior is present. Examining this relationship with alcohol consumption as a continuous variable would provide additional insight into the potential effects alcohol consumption has on gambling behavior.

Neurocognitive Findings in Onychophagia (Pathological Nail Biting).

A notable number of people struggle to control the desire to bite their nails, resulting in impairment and distress. Understanding this behavior and the inability to control it has received little research attention. One possible mechanism to understand nail biting is through the use of neurocognitive assessments. Neurocognitive assessments of pathological nail biting, however, are lacking. This analysis assesses the clinical presentation and neurocognitive profile of adults with nail biting relative to participants without nail biting. A total of 87 participants (aged 18-29 years) were recruited for a study on nail biting in young adults. Participants completed diagnostic, self-report, and neurocognitive measures which assessed two cognitive domains - motor impulsivity and cognitive flexibility. In the sample, 34 participants reported current nail biting. The nail biting group showed no significant differences in impulsivity or cognitive flexibility compared to the healthy controls. The lack of association between nail biting and cognitive deficits suggests that perhaps identifying meaningful subtypes of nail biting that reflect distinct pathology from normal grooming behavior may be important.

Trichotillomania and its clinical relationship to depression and anxiety.

OBJECTIVE: Trichotillomania (TTM) is associated with high rates of co-occurring depression and anxiety disorders. What the co-occurrence of TTM, depression or anxiety disorders means clinically and cognitively, however, has garnered little research attention. METHODS: About 530 adults with TTM were examined on a variety of clinical measures including symptom severity, psychosocial measures of functioning, psychiatric comorbidity and neurocognitive testing assessing motor inhibition and cognitive flexibility. Clinical features and cognitive functioning were compared between TTM patients with current comorbid major depressive disorder (MDD), a current anxiety disorder, both MDD and an anxiety disorder, or neither. RESULTS: Of 530 participants, 58 (10.3%) had MDD only, 97 (18.3%) had an anxiety disorder only, 58 (10.3%) had both MDD and an anxiety disorder, and 317 (59.8%) had neither. For almost all clinical measures, those with MDD only reported worse symptoms than those with an anxiety disorder only, and the combination of MDD and an anxiety disorder reported the worst level of symptom severity. CONCLUSIONS: These results suggest that adults with TTM and co-occurring MDD and anxiety disorders exhibit unique clinical differences. The clinical differences may also have treatment implications.

Sex differences in trichotillomania.

BACKGROUND: Trichotillomania (TTM) appears to be a fairly common disorder, yet little is known about sex differences in its clinical presentation. Long thought to be a primarily female disorder, males with TTM may have unique clinical presentations. METHODS: Participants with TTM (N = 462) were examined on a variety of clinical measures including symptom severity, functioning, and psychiatric comorbidity. Clinical features were compared between males (n = 27) and females (n = 435). RESULTS: There were many similarities in the clinical presentations of males and females with TTM. Males with TTM, however, were more likely to pull from their face, arms, and torso, and were more likely to suffer from a co-occurring substance use disorder. Females were more likely to be younger and less likely to be married. CONCLUSIONS: This study suggests that, although few males seek treatment for TTM, sex differences may be an important clinical factor when assessing and treating this disorder. Further research is needed to validate these findings and identify whether treatments should be tailored differently for males and females with TTM.