John A. Fayyad

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BACKGROUND Little is known about the epidemiology of adult attention-deficit hyperactivity disorder (ADHD). AIMS To estimate the prevalence and correlates of DSM-IV adult ADHD in the World Health Organization World Mental Health Survey Initiative. METHOD An ADHD screen was administered to respondents aged 18-44 years in ten countries in the Americas,(More)
CONTEXT Little is known about the extent or severity of untreated mental disorders, especially in less-developed countries. OBJECTIVE To estimate prevalence, severity, and treatment of Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV) mental disorders in 14 countries (6 less developed, 8 developed) in the World Health(More)
BACKGROUND Although significant associations of childhood adversities with adult mental disorders are widely documented, most studies focus on single childhood adversities predicting single disorders. AIMS To examine joint associations of 12 childhood adversities with first onset of 20 DSM-IV disorders in World Mental Health (WMH) Surveys in 21 countries.(More)
BACKGROUND Attention deficit hyperactivity disorder (ADHD) is among the most common psychiatric disorders of childhood that persists into adulthood in the majority of cases. The evidence on persistence poses several difficulties for adult psychiatry considering the lack of expertise for diagnostic assessment, limited treatment options and patient facilities(More)
BACKGROUND There are no published data on national lifetime prevalence and treatment of mental disorders in the Arab region. Furthermore, the effect of war on first onset of disorders has not been addressed previously on a national level, especially in the Arab region. Thus, the current study aims at investigating the lifetime prevalence, treatment, age of(More)
Data are presented on patterns of failure and delay in making initial treatment contact after first onset of a mental disorder in 15 countries in the World Health Organization (WHO)'s World Mental Health (WMH) Surveys. Representative face-to-face household surveys were conducted among 76,012 respondents aged 18 and older in Belgium, Colombia, France,(More)
CONTEXT Although numerous studies have examined the role of latent variables in the structure of comorbidity among mental disorders, none has examined their role in the development of comorbidity. OBJECTIVE To study the role of latent variables in the development of comorbidity among 18 lifetime DSM-IV disorders in the World Health Organization World(More)
BACKGROUND Studies of the impact of mental disorders on educational attainment are rare in both high-income and low- and middle-income (LAMI) countries. AIMS To examine the association between early-onset mental disorder and subsequent termination of education. METHOD Sixteen countries taking part in the World Health Organization World Mental Health(More)
BACKGROUND Mental disorders are believed to account for a large portion of disease burden worldwide. However, no national studies have been undertaken to assess this assumption in the Arab world. METHODS As part of the WHO World Mental Health (WMH) Survey Initiative, a nationally representative psychiatric epidemiological survey of 2857 adults (aged 18(More)
BACKGROUND Although it is known that childhood attention-deficit/hyperactivity disorder (ADHD) often persists into adulthood, childhood predictors of this persistence have not been widely studied. METHODS Childhood history of ADHD and adult ADHD were assessed in 10 countries in the World Health Organization World Mental Health Surveys. Logistic regression(More)