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. Author manuscript; available in PMC: 2014 Jun 27.

Published in final edited form as: Neurotoxicology. 2013 Feb 16;36:1–9. doi: 10.1016/j.neuro.2013.02.003

Table 2.

Characteristics of exposed and unexposed participants.

	Exposed				Reference participants

	n	Mean	SD	Range	n	Mean	SD	Range	p
Age [years]	579	42.5	9.6	19.2–68.0	431	42.4	8.7	22.0–64.0	0.87^a
Education [years]	361	9.6	2.6	1.0–18.0	350	10.2	2.8	4.0–18.0	0.01^a
Exposure [years]	489	17.2	8.5	0.50–44.0	433	–	–	–
MnB^b [µg/L]	558	15.2	17.3	0.7–160.5	386	7.5	4.4	2–41.4	0.00^c
Alcohol	573	Yes: 443 no: 130			427	Yes: 322 no: 105			0.48^d
Smoking	578	Yes: 297 no: 281			430	Yes: 197 no: 233			0.06^d

^a

t Test.

^b

Manganese in blood.

^c

Wilcoxon test.

^d

Chi² test.