Patients classified as F4 Neurotic, stress-related, and somatoform disorders using the criteria in the International Classification of Diseases (ICD)-10 who had anxiety or fear at the core of their symptoms were extracted and separated into a group of Anxiety or fear-related disorders. Separation anxiety disorder and Selective mutism were also classified into this group, as they have the same core symptoms. In the Diagnostic and Statistical Manual of Mental Disorders (DSM)-5 criteria, which were published earlier, Obsessive-compulsive and related disorders and Trauma- and stress-related disorders were separated from the Anxiety disorders categorization of DSM-IV as new categories, in line with the reclassification of Separation anxiety disorder and Selective mutism as Anxiety disorders. In ICD-11, the ICD-10 distinction between Phobic anxiety disorder and Other anxiety disorders was abolished in favor of a more clinically useful way of characterizing each Anxiety or fear-related disorder based on its concern (anxiety, physiological hyperarousal, and stimuli reported by the individual as causing maladaptive behavioral responses).
 It is considered that by organizing a group of disorders with anxiety or fear at the core of their symptoms, diagnostic clarity and clinical usefulness are improved over ICD-10. On the other hand, it will be important to continue to examine comorbidity with Mood disorders, Obsessive-compulsive or related disorders, comorbidity within Anxiety or fear-related disorders, and the position of panic attacks.
 Authors' abstract