Objectives: To check the legitimacy of the presumption that there are many "neurotic" disorders.
Methods: Taxonomic analyzes by single linkage method, unweighted pair-group average and Ward's method, also k-means clustering. The material in the pilot study used the information obtained from the Symptom Checklist "O", completed before treatment by 4,649 patients, who applied for treatment due to various functional disorders. The basic study used questionnaires filled in by 288 patients with diagnosed neurotic disorders and by 95 not-neurotic persons, constituting a control group.
Conclusions: The results suggest that the symptoms of functional disorders constitute one set (syndrome), thus the conviction of the multiplicity of neurotic disorders seems unjustified.
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