Coexisting psychiatric problems and stressful life events in adults with symptoms of ADHD--a large Swedish population-based study of twins.

Objective: To explore the associations of subtypes of adult ADHD with other psychiatric problems, stressful life events, and sex differences.

Method: Odds ratios were calculated using information from 17,899 participants from a population-based survey of adult twins born in Sweden between 1959 and 1985.

Results: Symptoms of attention deficit hyperactivity disorder (ADHD) were associated with an increased risk for symptoms of (odds ratio [95% confidence interval]): generalized anxiety disorder (5.