Table 3. Predicting probable/definitive PD versus no PD diagnosis.

	OR	95% CI	p
Univariate models
Age (18–24 vs 24+)	0.721	0.570, 0.913	0.0066
US Region (South vs Midwest/Northeast/West)	0.747	0.646, 0.864	<0.0001
Income Level (<25K vs 25K+)	0.820	0.673, 0.997	0.0469
Multivariable model (stepwise)*
Age (18–24 vs 24+)	0.642	0.497, 0.828	0.0006
US Region: South vs Midwest/Northeast/West	0.752	0.647, 0.872	0.0002

* All three variables in model.