• The statistical technique of cluster analysis was applied to 252 hospitalized patients' scores on the 29 statements of the Diagnostic Interview for Borderlines. We found that this statistical treatment could reliably differentiate borderline disorder from other personality disorders. Two subtypes similar to Spitzer's schizotypal and unstable subtypes emerged.
Barrash J, Kroll J, Carey K, Sines L. Discriminating Borderline Disorder From Other Personality DisordersCluster Analysis of the Diagnostic Interview for Borderlines. Arch Gen Psychiatry. 1983;40(12):1297-1302. doi:10.1001/archpsyc.1983.01790110039008