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Table 1 Levels of fluoride naturally ingested from drinking water and body fluids in different sample groups

From: A comparative study of fluoride ingestion levels, serum thyroid hormone & TSH level derangements, dental fluorosis status among school children from endemic and non-endemic fluorosis areas

Parameters	Group 1A	Group 1B	Group 2	Total
Water fluoride (WF)	1.6–5.1 ppm	1.6–5.5 ppm	0.98–1 ppm	0.98–5.5 ppm
Urine fluoride (UF)	0.24–8.9 ppm	0.4–7.79 ppm	0.19–1.01 ppm	0.24–8.9 ppm
Serum fluoride (SF)	0.02–0. 77 ppm	0.03–0.75 ppm	0.02–0.09 ppm	0.02–0.77 ppm

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