The DSM-5 merged the first three axes into one to eliminate what are now considered arbitrary differences between diagnoses. It is also envisaged that this may aid physicians, researchers, and insurance companies in the organization of data. The most important change made by the DSM-5 is the elimination of the term "disorder" from the title of these categories instead referring to them as "Conditions". Axis I of the DSM-5 is called Clinical Syndromes. It consists of 26 clinical conditions that psychiatrists have found useful in describing how people think and act. These conditions are: anxiety disorders; attention-deficit/hyperactivity disorder (ADHD); bipolar disorder; borderline personality disorder (BPD); chronic fatigue syndrome (CFS); depression; eating disorders; fetal alcohol spectrum disorders (FASD); fetal brain abnormalities; gambling disorder; obsessive-compulsive disorder (OCD); oppositional defiant disorder (ODD); panic disorder; pedophilia; post-traumatic stress disorder (PTSD); schizophrenia; sexual dysfunctions; substance abuse disorders; trichotillomania (hair-pulling disorder); and other specified disorders not elsewhere classified. Axis II of the DSM-5 is called Severity Levels. They consist of four categories: mild, moderate, severe, and extreme. Within each category, there are different subtypes or diagnostic groups.