“…In addition, the presence of either of these disorders decreased the probability that the other disorder would be present. Other investigators have successfully discriminated anxious from depressed patients on the basis of patient responses to rating scales (Lipman, 1982), symptom checklists (e.g., Preusoff & Klerman, 1974), vegetative symptomatology (Mathew et aL, 1982), psychometric tests (Jarrett & Schnurr, 1979), and psychophysiological measure (Kelly & Walter, 1969;Lader et al, 1967;Lader, 1976;Lader & Wing, 1969). The sum result of these studies is that anxiety and depression symptoms covary in many cases; nevertheless, each symptom cluster can be reliabily and independently identified.…”