This study examined the occurrence, correlates, and psychiatric co-morbidities of lifetime and 12-month intermittent explosive disorder (IED) and whether impairment due to IED differed across Latino groups. We used data on 2,554 Latino adults (75.5% response rate) from the National Latino and Asian American Study (NLAAS). Lifetime and 12-month prevalence of IED among Latinos were 5.8% and 4.1%, respectively. Unemployment was a common risk factor for both lifetime and 12-month IED. Protective factors for both lifetime and 12-month IED were having poor/fair English proficiency and being born outside the U.S. mainland. Cubans, Mexicans and other Latinos had lower odds of both lifetime and 12-month IED relative to Puerto Ricans, while Puerto Ricans with IED did not demonstrate worse impairment compared with the other groups with IED. Lifetime and 12-month IED were associated with several depressive, anxiety, and substance use disorders. Given its significant association with a wide-range of mental disorders, future research should consider the validity of IED as a unique disorder or whether it is merely a constellation of symptoms that accompanies a variety of mental diseases.
KeywordsHispanic Americans; impulse control disorders; mental health; comorbidity; epidemiology A small handful of empirical studies of intermittent explosive disorder (IED) exist in the psychiatric literature. According to McElroy (1999), IED is characterized as having aggressive impulses and uncontrollable physical assaults and/or property destruction that occur on several occasions, with nosology similar to disorders, such as antisocial personality disorder, borderline personality disorder, conduct disorder, attention-deficit/hyperactivity disorder, as well as physical health problems, such as Alzheimer's disease. The episodes must be independent of other psychiatric disorders, general medical conditions, or substance use, including medications, and they must be grossly out of proportion to the stressor.Recent clinical and population-based data show that IED is more common in the population than previously thought. For example, Coccaro, Schmidt, Samuels, and Nestadt (2004) examined the lifetime and 1-month prevalence of IED in a community sample from the Hopkins Epidemiology Study of Personality. They demonstrated that 6.3% of the sample
NIH-PA Author ManuscriptNIH-PA Author Manuscript NIH-PA Author Manuscript met full lifetime IED criteria, and 2.4% met full 1-month criteria. Similar results were found in an outpatient clinical study of 1,300 participants in Rhode Island (Coccaro, Posternak, & Zimmerman, 2005). Coccaro et al. (2005) reported that 6.3% of outpatients met criteria for lifetime IED, and 3.1% met criteria for current IED. In a study using the National Comorbidity Survey Replication Study, a national probability study, Kessler, Coccaro, Fava, Jaeger, Jin, and Walters (2006) reported similar findings. They found that the lifetime and 12-month prevalence estimates for IED were 7.3% and 3.9%, respectively. Both Coccaro et...