Water quality indicator levels between communities reporting cases of type 1 diabetes during the study period and those reporting none
| Water quality indicator | One-way ANOVA analyses | ||
| F value | P value | statistically significant | |
| Nutrients and metals | |||
| Ammonia | 7.65 | 0.006 | ∗ |
| DOC | 3.80 | 0.052 | |
| Nitrate (nitrite) | 1.78 | 0.183 | |
| Kjeldahl nitrogen | 1.14 | 0.287 | |
| Total phosphorus | 0.64 | 0.426 | |
| Aluminum | 0.02 | 0.886 | |
| Antimony | 1.62 | 0.204 | |
| Arsenic | 1.82 | 0.178 | |
| Barium | 4.57 | 0.033 | * |
| Cadmium | 0.22 | 0.637 | |
| Chromium | 0.60 | 0.438 | |
| Copper | 4.94 | 0.027 | * |
| Iron | 1.03 | 0.309 | |
| Lead | 4.71 | 0.031 | * |
| Magnesium | 6.85 | 0.009 | * |
| Manganese | 1.69 | 0.195 | |
| Mercury | 0.89 | 0.345 | |
| Nickel | 0.38 | 0.537 | |
| Selenium | 2.82 | 0.094 | |
| Uranium | 4.24 | 0.040 | * |
| Zinc | 3.16 | 0.076 | * |
| Physical parameters and major ions | |||
| Alkalinity | 6.43 | 0.012 | * |
| Color | 9.55 | 0.002 | * |
| Conductivity | 7.74 | 0.006 | * |
| Hardness | 6.78 | 0.010 | * |
| pH | 1.73 | 0.189 | |
| Total dissolved solids | 7.61 | 0.006 | * |
| TSS | 1.20 | 0.275 | |
| Turbidity | 4.07 | 0.044 | * |
| Boron | 0.63 | 0.428 | |
| Bromide | 1.30 | 0.255 | |
| Calcium | 5.86 | 0.016 | * |
| Chloride | 4.26 | 0.040 | * |
| Fluoride | 0.52 | 0.470 | |
| Potassium | 4.35 | 0.038 | * |
| Sodium | 4.63 | 0.032 | * |
| Sulfate | 0.64 | 0.425 | |
*One-way ANOVA; significant difference defined at P<0.05.
ANOVA, analysis of variance; DOC, dissolved organic content; TSS, total suspended solids.