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Mean fluoride concentrations by region in the city of Durango. The three geographic regions yielded significantly different values using ANOVA (P < 0.00).
| Geographic region | Mean fluoride concentration (ppm) | Number of wells | Standard error | Confidence interval (95%) |
|---|---|---|---|---|
| Central region | 2.551 | 7 | 0.137 | [2.820, 2.283] |
| Northern region | 5.300 | 31 | 0.170 | [5.633, 4.968] |
| Southern region | 3.582 | 25 | 0.157 | [3.890, 3.274] |
