Characteristic

Neurological disease

Statistical significance^a

Absent

Present

Number of cases

n = 118

n = 16

n/a

pH (mean +/− SD)

7.56 +/− 0.25

7.39 +/− 0.23

p = 0.0141

Total hardness (ppm^b)

238.11 (1.00, 2659.81)

322.49 (79.31, 1993.42)

p = 0.0843

Phosphorus (ppm^b)

0.10 (0.10, 2.62)

0.10 (0.10, 1.44)

p = 0.0211

Potassium (ppm^b)

0.10 (0.10, 29.18)

1.74 (0.10, 25.53)

p = 0.0146

Magnesium (ppm^b)

22.41 (0.10, 454.40)

30.84 (9.22, 224.85)

p = 0.0381

Manganese (ppm^b)

0.01 (0.01, 1.68)

0.02 (0.01, 0.12)

p = 0.3861

Iron (ppm^b)

0.12 (0.01, 3.81)

0.07 (0.01, 0.73)

p = 0.5546