Hi Robert,

Well, there's only one human race, so I guess your question must be culture related! It's a good question but not one that is easily answered. Countries vary in their levels of medical sophistication, technology, methods of recording or access to records. This is one reason why obtaining accurate stats at the global level is a bit of a problem. 

Having said that, it does appear that developing countries have a lower prevalence of schizophrenia. Yet, the outcome for schizophrenia is better in developed countries. Even within a single country, the cultural mix can throw up some interesting differences, with some groups being over-represented in the stats. Some argue this is to do with the way we measure mental health without due regard to cultural norms. Some cultures are more accepting of what we might describe as mental illness and some are very protective of relatives, who may never actually receive treatment and do not therefore make it on to the records.

I know this doesn't directly answer your specific question, but it does appear that no country or culture is free from schizophrenia (paranoid or otherwise). If you'd like to dig a little deeper into the stats a simple Google search will produce some good results. Here's a start from schizophrenia.com