Different..Not Deficit but Benefit!

There isn't a definitive, widely accepted ratio of neurodivergent to neurotypical people worldwide for a couple of reasons:

Neurodiversity is a spectrum: Many Neurodevelopmental conditions like ADHD, Autism Spectrum Disorder (ASD), and Dyslexia fall under the umbrella of neurodivergence. These conditions present themselves in a wide range of severities. Someone with a mild case of ADHD might not be diagnosed, while someone with a severe case of ASD may require significant support. Because it is a spectrum, it's difficult to draw a clear line between neurotypical and neurodivergent.

Diagnosis rates are increasing: Greater awareness and improved diagnostic tools have led to a significant increase in diagnosed Neurodevelopmental conditions in recent years. This doesn't necessarily mean there's a growing number of neurodivergent people, but rather that more are being identified.

Lack of global data: Reliable data on neurodiversity prevalence is often limited or not available in many parts of the world.

Research suggests that Neurodevelopmental conditions are more common than previously thought. Studies on specific conditions like ADHD and ASD provide estimates, but these vary depending on the study and diagnostic criteria.

Resources for further reading:

National Institute of Mental Health (NIMH) on ADHD: National Institute of Mental Health (NIMH) ADHD info page: https://www.nimh.nih.gov/health/topics/attention-deficit-hyperactivity-disorder-adhd

Centers for Disease Control and Prevention (CDC) on ASD: Centers for Disease Control and Prevention Autism Spectrum Disorder (ASD): https://www.cdc.gov/ncbddd/autism/data.html)