TABLE 2.

CSF metal/metalloid levels (median, 25th, and 75th percentile) for ALS cases and controls.

Metal/metalloid (μg/L)	Control N = 9 Median (IQR)	ALS N = 29 Median (IQR)	P-value
Cu*	129.70 (95.55–258.7)	80.12 (70.25–138.5)	0.05
Ni	2.23 (1.84–3.73)	3.66 (3.10–5.52)	0.07
Hg	0.27 (0.10–0.76)	0.26 (0.16–0.38)	0.61
As	0.90 (0.59–1.55)	0.70 (0.58–1.24)	0.52
Mn	2.07 (1.39–2.85)	1.75 (1.43–2.72)	0.51
Fe	283.0 (197.8–371.9)	201.3 (157.1–296.0)	0.19