Industry research on a global scale is never easy, even for the largest organizations. For example, when the World Health Organization attempted to systematically collect information on expenditure on mental health across the countries in the European Region in 2001 only 23 of the 52 countries provided any information at all.

Over the past year, NeuroInsights has been developing a report on the global neurotechnology industry. In one section we have aggregated various data sources in order to estimate the prevalence of major neurological diseases and psychiatric illness for the U.S. and worldwide. Here are our current numbers:

I'd be very interested if anyone has different numbers.