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Watson and Clark (1991) proposed the Tripartite Model of Anxiety and Depression to help explain the comorbidity between anxious and depressive symptoms and disorders. [1] This model divides the symptoms of anxiety and depression into three groups: negative affect, positive affect and physiological hyperarousal.
The symptoms of anxiety and depression disorders can be very similar. A diagnosis of mixed anxiety–depressive disorder as opposed to a diagnosis of depression or an anxiety disorder can be difficult. Due to this, it has long been a struggle to find a singular set of criteria to use in the diagnosis of mixed-anxiety depressive disorder. [3]
People with clinical depression can develop RBD, and vice versa and both illnesses have similar risks. [30] [clarification needed] Minor depressive disorder, or simply minor depression, which refers to a depression that does not meet full criteria for major depression but in which at least two symptoms are present for two weeks. [31]
Winter depression is a common slump in the mood of some inhabitants of most of the Nordic countries. Iceland, however, seems to be an exception. A study of more than 2000 people there found the prevalence of seasonal affective disorder and seasonal changes in anxiety and depression to be unexpectedly low in both sexes. [63]
Social predictors of depression are aspects of one's social environment that are related to an individual developing major depression.These risk factors include negative social life events, conflict, and low levels of social support, all of which have been found affect the likelihood of someone experiencing major depression, the length of the depression, or the severity of the symptoms.
A mixed affective state, formerly known as a mixed-manic or mixed episode, has been defined as a state wherein features and symptoms unique to both depression and (hypo)mania, including episodes of anguish, despair, self doubt, rage, excessive impulsivity and suicidal ideation, sensory overload, racing thoughts, heightened irritability, decreased "need" for sleep and other symptoms of ...
For many, the symptoms of both depression and anxiety are not severe enough (i.e., are subsyndromal) to justify a primary diagnosis of either major depressive disorder (MDD) or an anxiety disorder. However, dysthymia is the most prevalent comorbid diagnosis of GAD clients.
A number of researchers have explored HADS data to establish the cut-off points for caseness of anxiety or depression. Bjelland et al (2002) [3] through a literature review of a large number of studies identified a cut-off point of 8/21 for anxiety or depression. For anxiety (HADS-A) this gave a specificity of 0.78 and a sensitivity of 0.9.
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