1. RA is relative age, AA is absolute age and it is centered around the mean. ERA and EAA are expected relative and absolute age. SES stands for socio-economic status. Analyses additionally include vectors for wave, country, and season of birth fixed-e?ects. Relative age Relative age, RA ic , is measured as the di?erence between student i 's age in class c, AGE ic , and the age of the oldest regular student I in class c;AGE Ic
2. Worldwide trends in body-mass index, underweight, overweight, and obesity from 1975 to 2016: a pooled analysis of 2416 population-based measurement studies in 128�9 million children, adolescents, and adults;L Abarca-G�mez;The Lancet,2017
3. Associations between socio-economic status and school-day dietary intake in a sample of grade 5-8 students in vancouver, canada;N Ahmadi;Public Health Nutrition,2015