mental illness, but rather distinct groups of individuals prone to differing combinations of disorders. Additionally, and more importantly, a class emerged that has not been identified in dimensional models—namely, the “multimorbid” class. Across both samples, this class emerged as the smallest of the five classes and it was clearly associated with the greatest overall severity of psychopathology, in terms of high probabilities of endorsement for all disorders. Additionally, what distinguished this class from other classes was the markedly elevated rates of bipolar I disorder relative to all other classes.
