According to the dsm iv tr what types of depression cause a marked impairment in occupational functioning?

Severity: The dsm IV impairments in functioning refer to severity of symptoms. In order to diagnose a major depressive episode, dysthymic disorder, or bipolar ii disorder, for instance, the symptoms need to cause clinically significant impairment in social, work, or other important areas of functioning almost every day. It's hard to work effectively when you cannot sustain mental energy or focus on tasks.