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

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

  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