. Author manuscript; available in PMC: 2018 Jan 1.

Published in final edited form as: Neurotoxicology. 2016 Nov 18;58:66–74. doi: 10.1016/j.neuro.2016.11.007

Table 2.

Pearson (A) and Spearman (B) correlation coefficients of R2^* values in basal ganglia regions with exposure metrics and whole blood metals.

	Among all subjects (N=71)			Welders (N=42)			Controls (N=29)
	R2^* CN	R2^* PUT	R2^* GP	R2^* CN	R2^* PUT	R2^* GP	R2^* CN	R2^* PUT	R2^* GP
*A. Pearson Correlations*

HrsW	.	.	.	−0.12	−0.09	−0.04	.	.	.
YrsW	.	.	.	0.07	0.14	−0.07	.	.	.
Cu	−0.02	−0.02	−0.11	−0.20	−0.16	−0.20	−0.24	−0.07	−0.13
Fe	0.19	−0.02	0.15	0.29	0.01	−0.04	−0.04	−0.19	0.41^*
Mn	−0.15	0.06	−0.16	−0.15	0.15	0.06	−0.38	−0.20	−0.57^**

*B. Spearman Correlations*

HrsW	.	.	.	−0.19	−0.20	−0.03	.	.	.
YrsW	.	.	.	0.21	0.25	0.21	.	.	.
Cu	−0.10	−0.07	−0.12	−0.25	−0.15	−0.16	−0.14	−0.08	−0.10
Fe	0.36^**	0.10	0.30^*	0.37^*	0.03	0.21	−0.10	−0.15	0.51^*
Mn	−0.22	−0.06	−0.30^*	−0.10	0.11	−0.11	−0.40^*	−0.27	−0.62^**

p <0.05,

^**

p <0.01

Correlations between R2* values and exposure metrics were conducted with adjustments for age.

Correlations between R2* values and whole blood Fe levels were conducted with adjustments for age and whole blood metals Cu and Mn. For R2* values and blood Mn level correlations, blood Cu and Fe levels were included in the analysis as covariates. For R2* values and blood Cu level correlations, blood Fe and Mn levels were used as covariates.