Sociodemographic characteristics of the four groups are presented in Table 1. At the baseline interview, subjects with non-comorbid bipolar II disorder (Group 1) were significantly younger than those with bipolar I disorder alone (Group 3). While no further differences across groups were detected regarding years of education, gender, ethnicity, marital status and holding of college degrees, a significantly higher proportion of group 4 members compared to group 1 were unemployed.
