Prevalence of intellectual disability: A meta-analysis of population-based studies

▶ The prevalence of intellectual disability across the world is around 1%. ▶ The prevalence is almost two times more in low and middle income countries compared to high income countries. ▶ Highest prevalence was seen in child and adolescent population. ▶ Using standardized diagnostic instruments and disability measurements leads to lower estimates compared to simple psychological assessment tools even if confirmed by clinicians.