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Unformatted text preview: MOOD DISORDERS Part II ONSET, COURSE, PREVALENCE, GENDER DIFFERENCES: MAJOR DEPRESSIVE DISORDER * Onset:- onset may be at any age- average onset: mid to late 20's- trend: earlier and earlier * Course:- with each episode, more episodes likely- after 3 episodes, life-long MDD likely * Lifetime Prevalence : - 10-15% * Gender differences:- 2:1 ratio (female: male) DYSTHYMIC DISORDER * Onset:- usually childhood or teens- onset is slow * Course:- chronic by definition (at least 2 years of duration)- may develop into unipolar MDD * Lifetime Prevalence : - 6% of population will develop dysthymia in their lifetime * Gender differences:- 5:2 (female: male) BIPOLAR I DISORDER * Onset:- average 18; 50% started by adolescence- trend: earlier and earlier- rarely starts after age 40- more acute onset than MDD- Precursor symptoms : labile affect, ADHD-like presentation (temper tantrums, hyperactive, impulsive); anger and violence; high sensitivity; quick to cry, sensitive to criticism and rejection; easily overwhelmed, easily over-stimulated); poor sleep pattern, violent nightmares *...
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- Fall '07