Fluoride Exposure and Age of Menarche: Potential Differences Among Adolescent Girls and Women in the United States

Table 2 Descriptive statistics for fluoride exposure according to race/ethnicity

	N	Median	IQR	Min	Max
Plasma fluoride (µmol/L)
Overall sample	524	0.34	0.30	0.18	4.09
Mexican American	131	0.30	0.20	0.18	2.99
Other Hispanic	64	0.29	0.19	0.18	0.92
Non-Hispanic white	137	0.37	0.33	0.18	3.02
Non-Hispanic black	112	0.38	0.33	0.18	1.61
Non-Hispanic Asian	55	0.33	0.20	0.18	4.09
Other race-including multi-racial	26	0.32	0.26	0.18	2.10
Water fluoride (mg/L)^a
Overall	460	0.48	0.53	0.07	2.28
Mexican American	107	0.51	0.53	0.07	2.28
Other Hispanic	49	0.49	0.38	0.07	1.33
Non-Hispanic white	124	0.44	0.56	0.07	1.03
Non-Hispanic black	106	0.61	0.54	0.07	1.24
Non-Hispanic Asian	53	0.50	0.50	0.07	1.37
Other race-including multi-racial	23	0.32	0.48	0.07	1.01