excess mortality from schizophrenia increased by from to oecd a less than of the swedish population develop bipolar disorder bipolar disorders are also found to be slightly more prevalent among women eliasson jonsson cullberg excess mortality from bipolar disorder in sweden increased by from to while of patients with bipolar are readmitted to the same hospital within days of release oecd a the prevalence rate of mental disorders also varies highly between age group gender and educational attainment which is shown in figure below