AF-5	Form-5 Self-Concept Questionnaire
AP	Academic performance
BMI	Body mass index
CI	Confidence interval
GPA	Grade point average
GRADE	Grading of Recommendations Assessment, Development and Evaluation
KIDMED	Mediterranean Diet Quality Index in Children and Adolescents
MedDiet	Mediterranean diet
MEDAS-14	14-item Mediterranean Diet Adherence Screener
MOOSE	Meta-analysis of Observational Studies in Epidemiology
NIH	National Institutes of Health
OR	Odds ratio
PECOS	Population, Exposure, Comparison, Outcome, and Study design
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-analyses
PROSPERO	International Prospective Register of Systematic Reviews
RoB 2	Risk-of-Bias tool for randomized trials
ROBINS-I	Risk of Bias in Non-randomized Studies–of Interventions
SMD	Standardized mean difference
UEE	University entrance examination