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Table 2 ICD 10 definition of depression

From: An exploratory mixed methods study of the acceptability and effectiveness of mindfulness -based cognitive therapy for patients with active depression and anxiety in primary care

Typical symptoms are
• Depressed mood – varies little from day to day, often unresponsive to circumstances. May show diurnal variation. Can be masked by added features such as irritability, alcohol, and histrionic behaviour.
• Loss of interest and enjoyment.
• Reduced energy leading to increased fatigability and diminished activity.
Other symptoms are
a) reduced concentration and attention
b) reduced self-esteem and self-confidence
c) ideas of guilt and unworthiness
d) bleak and pessimistic views of the future
e) ideas of self harm
f) disturbed sleep
g) diminished appetite
Mild Depressive Episode: Two 'typical' symptoms plus at least 2 'other' for 2 weeks. Usually distressed by the symptoms and has some difficulty in continuing with ordinary work and social activities, but will probably not cease to function completely.
Moderate Depressive Episode: Two 'typical' plus at leas 3 'other' preferable 4 and to marked degree.
Severe Depressive Episode: Considerable distress or agitation (or retardation).