. Author manuscript; available in PMC: 2010 Apr 22.

Published in final edited form as: Mov Disord. 2009 Jun 15;24(8):1200–1205. doi: 10.1002/mds.22557

TABLE 3. Adjusted analysis of predictors of PD risk among Pennsylvania state Medicaid-eligible middle-aged adults, 1999–2003.

	Relative risk	95% CI	P
Black race^a	0.45	0.32, 0.64	<0.0001
Hispanic ethnicity^a	0.68	0.38, 1.22	0.20
Age ≥50 years	1.44	1.09, 1.89	0.01
Male	1.22	0.97, 1.53	0.09
Urban area of care	0.95	0.75, 1.19	0.64
Average no. of visits/year^b
2nd quartile	1.52	0.90, 2.57	0.12
3rd quartile	2.74	1.67, 4.49	<0.0001
4th quartile	4.35	2.69, 7.03	<0.0001
Medicaid eligibility due to disability	0.43	0.30, 0.62	<0.0001

Reference category non-Hispanic white Americans.

Quartiles for yearly visits: 1st quartile (reference category) = 0 visits; 2nd quartile = 0.2–1.8 visits; 3rd quartile = 1.9–4.9 visits; 4th quartile = ≥5 visits.