There are a number of possible explanations— some real, others factitious—for any observed differences in the prevalence of PD between groups of European origin and Africans or African Americans. First, we must consider that the differences in prevalence are real and the result of biological or environmental differences between populations. There is some evidence to [...]

A search of the 1988 mortality files, created by the National Center for Health Statistics (NCHS), looking for individuals who died with an ICD-9 diagnosis of PD revealed racial differences. Whether PD was the underlying cause of death, a contributing cause, or just a diagnosis that people carried, whites had significantly higher rates than blacks. [...]

Of the 750 inpatient and outpatient cases which Harries had seen in his neurology practice in Kenya over a five-year period, he observed 27 cases of PD (-4% of neurology patients) with an age range of 45-60 years. A survey of patients admitted to the hospital over a one-year period in what was formerly known [...]

INTRODUCTION
Parkinson’s disease (PD) is a common progressive neurodegenerative disorder characterized clinically by bradykinesia, resting tremor, rigidity, and postural instability. Symptomatic response to L-DOPA therapy is also often used as an additional diagnostic criterion. It affects 1-2% of the population over the age of 60 years, although the disease is seen in younger individuals as well. [...]