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Table 5 Comparison of fluoride concentrations in mg/L across communities with low and high fluoridation concentrations in Northern California and Canada

From: Maternal and fetal exposures to fluoride during mid-gestation among pregnant women in northern California

 Community water fluoride <=0.3 mg/L (Mean ± SD)Commuunity water fluoride (> 0.3 mg/L) (Mean ± SD)
Fluoride concentrationsCanadaNorthern California (N = 17)CanadaNorthern California (N = 31)
Water0.12 ± 0.060.099 ± 0.0760.61 ± 0.110.71 ± 0.18*
Maternal urine 0.46 ± 0.20 0.72 ± 0.43*
Maternal urine adjusted for specific gravity0.41 ± 0.280.45 ± 0.180.71 ± 0.380.74 ± 0.38*
  1. * The Northern California high fluoridation mean concentration is significantly different from the Northern California low fluoridation mean concentration at the 0.01 confidence level using Welch’s t-test
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