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Some depression rating scales are completed by patients. The Beck Depression Inventory, for example, is a 21-question self-report inventory that covers symptoms such as irritability, fatigue, weight loss, lack of interest in sex, and feelings of guilt, hopelessness or fear of being punished. [11]
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The need for sleep is usually reduced during manic phases. During periods of depression, there may be crying, a negative outlook on life, and poor eye contact with others. [1] The risk of suicide among those with the illness is high at greater than 6 percent over 20 years, while self-harm occurs in 30–40 percent. [1]
The Children's Depression Inventory (CDI and CDI2) is a psychological assessment that rates the severity of symptoms related to depression or dysthymic disorder in children and adolescents. [1] The CDI is a 27-item scale that is self-rated and symptom-oriented. [ 1 ]
The General Behavior Inventory (GBI) is a 73-question psychological self-report assessment tool designed by Richard Depue [1] [2] [failed verification] and colleagues to identify the presence and severity of manic and depressive moods in adults, as well as to assess for cyclothymia.
Population studies have consistently shown major depression to be about twice as common in women as in men, although it is not yet clear why this is so. [7] The relative increase in occurrence is related to pubertal development rather than chronological age, reaches adult ratios between the ages of 15 and 18, and appears associated with psychosocial more than hormonal factors.
For example, in the context of depression, the diathesis-stress model can help explain why Person A may become depressed while Person B does not, even when exposed to the same stressors. [7] More recently, the diathesis-stress model has been used to explain why some individuals are more at risk for developing a disorder than others. [ 9 ]
One meta analysis on first episode depression observed distinct patterns of grey matter reductions in medication free, and combined populations; medication free depression was associated with reductions in the right dorsolateral prefrontal cortex, right amygdala, and right inferior temporal gyrus; analysis on a combination of medication free ...