Table 4A.

Metal concentrations in the SN of PDD cases and controls.

Metal	Units	PDD (n = 9)	Controls (n = 9)	p-value
Na	mmol per kg	248.3 (219.3–277.2)	252.3 (229.5–275.1)	0.7
Mg	mmol per kg	19.7 (18.8–20.6)	20.0 (19.3–20.7)	0.3
K	mmol per kg	246.0 (226.6–265.4)	249.3 (235.0–263.7)	0.6
Ca	mmol per kg	6.0 (3.8–8.3)	5.3 (3.9–6.7)	0.7
Mn	μmol per kg	19.3 (15.2–23.5)	25.2 (20.6–29.9)	0.04
Fe	mmol per kg	4.8 (3.1–6.5)	4.6 (3.4–5.8)	1.0
Cu	μmol per kg	201.8 (174.1–229.6)	306.8 (248.4–365.2)	0.003
Zn	μmol per kg	595.0 (550.7–639.2)	669.7 (579.4–759.9)	0.2
Se	μmol per kg	6.6 (6.0–7.3)	7.1 (6.4–7.8)	0.2

Data are means (±95% CI) taken over three replicate runs; P-values for significance of between-group differences were calculated by Mann-Whitney U-test. P < 0.05 is considered significant. Significant case-control differences are highlighted in bold.