Table 2.

Prevalence of PD in Copiah County, Mississippi in 1978 standardized to US population 2010^a

Sex	Age, years	Denominator	Cases	US population 2010	Expected cases	Age-standardized prevalence/100,000
Male	40–64	2473	4	50,137,484	81,096
	65–74	948	4	10,096,519	42,601
	75+	472	5	7,266,441	76,975
Female	40–64	3016	3	52,242,925	51,966
	65–74	1235	8	11,616,910	75,251
	75+	781	7	11,288,114	101,174
Total			31	142,648,393	429,063	301

^aBased on previously published work by others.⁷ Includes possible and definite cases with 5 of the 31 cases designated as post-encephalitic parkinsonism. These were not removed because age-specific numbers were not available by diagnosis