Rethinking School Entry Timelines: Why Relative Age Impacts Thai Students’ Wellbeing
A landmark international study finds younger pupils in a class, often born later in the year, face higher odds of mental health concerns than their older peers. Analyzing health records of more than a million children, the research prompts education systems worldwide, including Thailand, to reconsider strict entry cutoffs that can unintentionally disadvantage students.
Researchers from Norway’s NTNU reviewed health data for children aged 4–17 born between 1991 and 2012. The study shows October–December births—the youngest in many classrooms—have higher rates of ADHD and related neuropsychiatric conditions compared with January–March births. The magnitude of risk varies with prematurity, with ADHD diagnoses among the youngest students rising by about 20–80 percent. A lead neonatology consultant notes a meaningful relative age effect in childhood mental health.