Table 1.

Summary statistics for demographic and exposure metrics (A) and blood metals (B) in welders and controls.

	Welders (N=42) Mean ± SD	Controls (N=29) Mean ± SD	p-values
A. Demographic and Exposure metrics
Age (years)	48.1 ± 11.2	44.0 ± 11.5	0.14
Education (years)	13.0 ± 1.7	16.2 ± 2.4	< 0.001***
HrsW (hours)	229 ± 184	0 ± 0 (0)	< 0.001***
YrsW (years)	25.8 ± 11.1	0 ± 0 (0)	< 0.001***
ALT1 (IU/L)	39.4 ± 17.5	37.3 ± 16.7	0.23
BMI (kg/m2)	28.9 ± 5.1	26.2 ± 3.4	0.04*
UPDRS-III	2.1 ± 2.5	1.6 ± 2.2	0.24
B. Whole Blood Metals
Whole Cu (ng/mL)	899 ± 113	754 ± 139	<0.001***
Whole Mn (ng/mL)	10.8 ± 3.2	8.5 ± 2.1	0.013*
Whole Fe (μg/mL)	560 ± 49	496 ± 77	<0.001***
Plasma blood levels
Plasma Fe (μg/dL)	104 ± 38	105 ± 32	0.97
Total_IBC2 (μg/dL)	324 ± 66	321 ± 52	0.81
Transferrin Saturation (%)	33 ± 13	33 ± 10	0.85
Hemoglobin (μg/dL)	15.2 ± 1.0	14.8 ± 0.8	0.07
RBC (μg/dL)	5.0 ± 0.4	5.0 ± 0.3	0.28

^*p <0.05,

^**p <0.01,

^***p<0.001

¹ALT = alanine aminotransferase;

²IBC = iron binding capacity