Table 3.

SNpc neuron densities and correlations with estimated PD risk

	Overall correlation with PD risk probability (n = 134)	Neuron counts by case status mean neurons/mm3 with 95%CI
		Diagnosed with PD (n = 31)	Controls
			LB-Yes (n = 78)	LB-No (n = 25)
Dorsomedial quadrant	–0.16, p = 0.10	9.1 (6.9–11.3)	15.3 (13.5–17.1)	19.4 (15.7–23.1)
Ventromedial quadrant	–0.28, p < 0.01	8.6 (6.2–11.0)	15.1 (13.2–17.0)	19.5 (15.9–23.1)
Dorsolateral quadrant	–0.08, p = 0.38	7.8 (6.0–9.6)	10.4 (9.1–11.7)	12.7 (9.5–15.9)
Ventrolateral quadrant	–0.23, p < 0.05	5.3 (3.6–7.0)	15.8 (13.8–17.8)	20.2 (17.5–22.9)
Total Neuron Density	–0.24, p < 0.01	7.7 (6.0–9.4)	14.3 (12.9–15.7)	18.2 (15.6–20.8)