*3.2.5 The relationship between the concentration of fluoride and type of sources of samples*

The results statistic analysis show that the different of the fluoride concentration between the different sources of water samples (dug well, bore well and spring) in the study area is not significantly different. Fluoride concentration decreases not significantly according to well's type F (2) =2.19, p = 0.121.

Fluoride concentration is positively and not significantly related to depth of the groundwater (r = 0.046, p > 0.05).
