. 2020 Jun 1;17(11):3914. doi: 10.3390/ijerph17113914

Table 3.

Fluoride content in filtered water in the 12 cities in Southwest region of KSA.

Water Source	Code	No. of Samples	Fluoride Content (ppm)			Std. Deviation
Water Source	Code	No. of Samples	Min.	Max.	Mean	Std. Deviation
Filtered Water	F1	5	0.40	2.15	1.11	0.65
	F2	5	0.30	2.55	1.02	0.89
	F3	5	0.03	2.45	0.89	1.03
	F4	5	0.05	2.45	1.12	0.86
	F5	5	0.07	2.55	0.98	0.94
	F6	5	0.40	2.05	1.11	0.76
	F7	5	0.08	2.25	1.19	0.80
	F8	5	0.50	1.75	1.05	0.51
	F9	5	0.30	2.05	0.93	0.70
	F10	5	0.30	2.05	0.91	0.68
	F11	5	0.30	2.25	1.11	0.77
	F12	5	0.50	2.35	1.21	0.69
	Average/mean		0.27	2.24	1.05	0.69