In a 2018 survey, American College Health Association reported that 63.4% of college students experienced overwhelming anxiety and 22.1% were diagnosed or professionally treated within the last 12 months.[34] Students may also experience social anxiety disorder which is characterized by significant anxiety or fear of judgment or embarrassment in social situations such as meeting or conversing with new people, public speaking, and attending parties or social gatherings. Students that have experienced significant traumatic events such as sexual assault may develop post-traumatic stress disorder. In 2015, Association of American Universities conducted a survey on sexual assault misconduct in colleges.