Characteristic | Neurological disease | Statistical significancea | |
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 (ppmb) | 238.11 (1.00, 2659.81) | 322.49 (79.31, 1993.42) | p = 0.0843 |
Phosphorus (ppmb) | 0.10 (0.10, 2.62) | 0.10 (0.10, 1.44) | p = 0.0211 |
Potassium (ppmb) | 0.10 (0.10, 29.18) | 1.74 (0.10, 25.53) | p = 0.0146 |
Magnesium (ppmb) | 22.41 (0.10, 454.40) | 30.84 (9.22, 224.85) | p = 0.0381 |
Manganese (ppmb) | 0.01 (0.01, 1.68) | 0.02 (0.01, 0.12) | p = 0.3861 |
Iron (ppmb) | 0.12 (0.01, 3.81) | 0.07 (0.01, 0.73) | p = 0.5546 |