Table 3. Cell density in corpus striatum.

Stained region per High Power Field (HPF)	Mn mine workers n=8	Non-Mn mine workers n=8	% difference	p value
Astrocytes caudate	9.85 ± 3.94	12.86 ± 3.90	23% ↓	0.146
Astrocytes putamen	8.91 ± 3.64	11.63 ± 2.97	23% ↓	0.125
Astrocytes GPe	12.80 ± 3.68	12.40 ± 3.64		0.846
Astrocytes GPi	10.60 ± 2.66	10.60 ± 3.64		0.979
Microglia caudate	1.25 ± 0.30	1.18 ± 1.01		0.856
Microglia putamen	1.29 ± 0.50	1.24 ± 0.60		0.859
Microglia GPe	1.33 ± 0.55	0.87 ± 0.34	53% ↑	0.064
Microglia GPi	1.37 ± 0.75	0.99 ± 0.49	38% ↑	0.250
Neurons caudate	16.50 ± 6.79	19.90 ± 3.72	17% ↓	0.235
Neurons putamen	16.00 ± 7.16	18.10 ± 3.30	11% ↓	0.455
Neurons GPe	1.87 ± 0.86	1.34 ± 0.52	40% ↑	0.162
Neurons GPi	2.05 ± 0.81*	1.28 ± 0.39	60% ↑	0.028*

^*p<0.05, two tailed t-test; GPe=globus pallidus external segment; GPi=globus pallidus internal segment