Underachievement is a significant issue for gifted learners. There is often a stark gap between the abilities of the gifted individual and their actual accomplishments. Many gifted students will perform extremely well on standardized or reasoning tests, only to fail a class exam. It is estimated that half of gifted children do not perform in school at a level that is up to their abilities. Studies of high school dropouts in the United States estimate that between 18% and 25% of the students who fail to graduate are gifted. This disparity can result from various factors, such as loss of interest in classes that are too easy or negative social consequences of being perceived as smart. Underachievement can also result from emotional or psychological factors, including depression, anxiety, perfectionism, low self esteem, or self-sabotage.