Drinking Water Fluoride Levels for a City in Northern Mexico (Durango) Determined Using a Direct Electrochemical Method and Their Potential Effects on Oral Health

Table 1

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]