DSM-IV generalized anxiety disorder in the Australian National Survey of Mental Health and Well-Being

School of Psychology, University of Sydney, NSW, Australia.
Psychological Medicine (Impact Factor: 5.94). 06/2002; 32(4):649-59. DOI: 10.1017/S0033291702005512
Source: PubMed

ABSTRACT This paper reports population data on DSM-IV generalized anxiety disorder from the Australian National Survey of Mental Health and Well-Being.
The data were obtained from a nationwide household survey of adults using a stratified multi-stage sampling process. A response rate of 78.1% resulted in 10,641 persons being interviewed. Diagnoses were made using the Composite International Diagnostic Interview. The interview was computerized and conducted by trained lay interviewers.
Prevalence in the total sample was 2.8% for 1-month GAD and 36% for 12-month GAD. Persons over 55 years of age were less likely to have GAD than those in the younger age groups. Logistic regression analysis also showed that a diagnosis of GAD was significantly associated with being of younger to middle age, being separated divorced or widowed, not having tertiary qualifications or being unemployed. Co-morbidity with another affective, anxiety, substance use or personality disorders was common, affecting 68% of the sample with 1-month DSM-IV GAD. GAD was associated with significant disablement, and 57% of the sample with DSM-IV GAD had consulted a health professional for a mental health problem in the prior 12 months.
The survey provides population data on DSM-IV GAD and its correlates. GAD is a common disorder that is accompanied by significant morbidity and high rates of co-morbidity with affective and anxiety disorders, and is associated with marital status, education, employment status, but not sex. Changes to DSM-IV diagnostic criteria did not appear to affect the prevalence rate compared to previous population surveys.

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    • "Its one-year prevalence in community samples in the US is around 3% and its lifetime prevalence around 5% (Blazer et al., 1991; Kessler et al., 2005a; Kessler et al., 2005b; Wittchen, 2002). Studies from other countries revealed roughly similar figures (Bijl et al., 1998; Faravelli et al., 1989; Hunt et al., 2002; Jenkins et al., 1997). GAD patients typically present in primary care settings, where the reported prevalence is up to 8% (Kroenke et al., 2007; Roy-Byrne & Wagner, 2004). "
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    ABSTRACT: Generalized Anxiety Disorder (GAD) is typically considered a chronic condition characterised by excessive worry. Lifetime prevalence is 4.3-5.9%, yet a small percentage seek treatment. GAD can be treated and in recent years online-delivered treatment interventions have shown promise. The paper aimed to systematically search for literature on online-delivered psychological interventions for the treatment of GAD and conduct a meta-analysis to examine their efficacy. The purpose of the paper is to inform the community of researchers in internet delivered interventions of the current state of the art and research gaps that require attention. A systematic search of the literature was conducted to find all studies for online-delivered treatments for GAD (N=20). Using Review Manager 5 all Randomized Controlled trials (RCTs; n = 11) that met our established eligibility criteria were included into a meta-analysis that calculated effect sizes via the standardised mean difference. Compared to the waiting-list controls, the results demonstrate positive outcomes for GAD symptoms (d = -0.91) and its central construct of pathological worry (d = -0.74). The meta-analysis supports the efficacy of online-delivered treatments for GAD including the use of disorder-specific (4 studies) and transdiagnostic treatment protocols (7 studies) delivered online. Caution is advised regarding the results as the data is limited and highly heterogeneous, but revealing of what future research might be needed.
    Internet Interventions 07/2015; In Press. DOI:10.1016/j.invent.2015.07.003
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    • "In the previous 1997 NSMHWB 17.7% of persons with 1-month diagnosis of GAD also had a 1-month diagnosis of DD (OR 6.8, 95% confidence interval 2.0–23.4) (Hunt et al. 2002). In NCS data almost 40% of persons with lifetime GAD had also DD (Wittchen et al. 1994). "
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    ABSTRACT: The nosological status of generalized anxiety disorder (GAD) versus dysthymic disorder (DD) has been questioned. The aim of this study was to examine qualitative differences within (co-morbid) GAD and DD symptomatology. Latent class analysis was applied to anxious and depressive symptomatology of respondents from three population-based studies (2007 Australian National Survey of Mental Health and Wellbeing; National Comorbidity Survey Replication; and Netherlands Mental Health Survey and Incidence Study-2; together known as the Triple study) and respondents from a multi-site naturalistic cohort [Netherlands Study of Depression and Anxiety (NESDA)]. Sociodemographics and clinical characteristics of each class were examined. A three-class (Triple study) and two-class (NESDA) model best fitted the data, reflecting mainly different levels of severity of symptoms. In the Triple study, no division into a predominantly GAD or DD co-morbidity subtype emerged. Likewise, in spite of the presence of pure GAD and DD cases in the NESDA sample, latent class analysis did not identify specific anxiety or depressive profiles in the NESDA study. Next, sociodemographics and clinical characteristics of each class were examined. Classes only differed in levels of severity. The absence of qualitative differences in anxious or depressive symptomatology in empirically derived classes questions the differentiation between GAD and DD.
    Psychological Medicine 09/2013; 44(08):1-12. DOI:10.1017/S0033291713002225 · 5.94 Impact Factor
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    • "In this study, we examined Generalized Anxiety Disorder (GAD) symptoms in a crosscultural perspective. The focus on GAD as a prototypic anxiety disorder was due to the fact that GAD is one of the most commonly occurring anxiety disorders in adolescents (Angst et al. 2006; Hunt et al. 2002). The core symptom of GAD is excessive, persistent, and uncontrollable worry (American Psychiatric Association 2000). "
    American Psychological Association (APA) Annual Convention, Hawaii, USA, USA; 08/2013
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