A 4-Year Prospective Follow-up of 75 Patients Utilizing Survival Analysis

has diagnos¬ tic, prognostic, and etiologic importance. Many studies of outcome in bipolar disorder were carried out before the era when well-defined diagnostic criteria were applied in the selection of such study populations or outcome measures were systematically defined.16 In many studies, the proportion of subjects with missing data because of unavailability for fol¬ low-up is not specified or unavailability for follow-up has not been...