Fluoride exposure and duration and quality of sleep in a Canadian population-based sample

Table 2 Descriptive statistics for fluoride measures (unweighted data shown)

	N	Mean	SD	25th percentile	50th percentile	75th percentile
Urinary fluoride, adjusted for specific gravity (mg/L)	1303	0.86	0.62	0.46	0.67	1.08
Tap water fluoride (mg/L)	1016	0.24	0.26	0.06	0.12	0.44
Fluoridated	342	0.52	0.22	0.42	0.58	0.69
Non-fluoridated	309	0.05	0.15	0.01	0.01	0.07
Mixed or unknown	365	0.14	0.11	0.09	0.11	0.14

ISSN: 1476-069X