Fluoride exposure and sleep patterns among older adolescents in the United States: a cross-sectional study of NHANES 2015–2016

Table 2 Descriptive statistics for fluoride exposure measures

Measure	Arithmetic mean	Standard error	Median	5th percentile	95th percentile
Plasma fluoride (μmol/L) ^a	0.35	0.02	0.29	0.14	0.67
Tap water fluoride (mg/L)^b	0.39	0.05	0.27	0.07	0.81

Note. Sampling weights were applied for calculation of all descriptive statistics. For water fluoride, descriptive statistics remained the same following reweighting of sampling weights; ^an = 473 (weighted N = 12,531,822); ^bn = 419 (weighted N = 11,577,700)