. Author manuscript; available in PMC: 2016 Jul 1.

Published in final edited form as: Neurotoxicology. 2015 Apr 23;49:8–14. doi: 10.1016/j.neuro.2015.04.002

Table 1.

Demographics for All Mine Workers and the Pathology Subset

	All Mine Workers (n = 29)			Pathology Subset (n = 14)
Characteristic	Non-Mn Mine Workers	Mn Mine Workers	p value	Non-Mn Mine Workers	Mn Mine Workers	p value
Age (mean ± SD)	58.22 ± 13.24	56.17 ± 7.7	0.623	58.36 ± 14.14	55.38 ± 8.54	0.643
Cumulative mining exposure - all mines (median years, IQR)	7.88 (1.8 – 18.17)	21.08 (12.36 – 31.09)	0.029^*	12.00 (4.26 – 18.37)	21.08 (12.37 – 30.50)	0.012^*
Cumulative Mn mining exposure (median years, IQR)	--	16.63 (4.31–31.71)	--	--	7.33 (1.3 – 24.9)	--
Mining employment to death (median years, IQR)	21.99 (13.80 – 33.40)	2.52 (0 – 18.11)	0.006^*	18.67 (14.0 – 36.0)	0.73 (0 – 17.8)	0.041^*
Death to autopsy (median days, IQR)	6.0 (3.75 – 7.25)	4.0 (3.0 – 6.0)	0.157	5.0 (3.0 – 6.0)	5.0 (3.0 – 6.0)	0.801
Death to scan (median days, IQR)	228 (203 – 255)	287 (157 – 316)	0.192	235 (221 – 254)	302 (284 – 477)	0.019^*

Abbreviations: SD, standard deviation, IQR, interquartile range.

Mann-Whitney U test compared Mn to non-Mn mine workers, p values ≤ 0.05.