*2.2. Eligibility Criteria*

We adapted the eligibility criteria used in the previous reports [27] to identify noninterventional and quantitative studies assessing the psychological impact of COVID-19 among college students. Studies were grouped according to the type of psychological morbidity observed, location (continent/country), quality score, and assessment method. Studies were included which met the following criteria: (1) use of the English language; (2) published from the inception of the pandemic to 27 July 2020; (3) utilized survey tools with good psychometric properties, and (4) full texts of the studies were available. Studies with the following characteristics were excluded: (1) Studies performed on populations other than students; (2) study designs utilizing descriptive, mixed-methods, qualitative approaches; (3) studies with unclear methodology or unvalidated survey tools; (4) studies using a language other than English; (5) studies conducted after 27 July 2020; (6) studies conducted among adolescents/students with pre-existing mental conditions, such as Attention Deficit Hyperactivity Disorder (ADHD); and (7) studies lacking the individual estimates for students.
