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Table 3 Urinary fluoride levels (mg/L) according to key covariates by sexa

From: Fluoride exposure and pubertal development in children living in Mexico City

Variable N Geometric mean (95% CI) p-value
Boys
 Age (years) ≥12 123 0.61 (0.57, 0.66) 0.35
< 12 34 0.58 (0.53, 0.65)  
 Number of siblings at birth < 2 55 0.58 (0.53, 0.64) 0.42
≥2 102 0.62 (0.57, 0.67)  
 Maternal Education (years) < 12 76 0.59 (0.54, 0.65) 0.22
12 56 0.65 (0.57, 0.73)  
> 12 25 0.56 (0.48, 0.64)  
 Marital status Married 119 0.62 (0.57, 0.67) 0.10
Other 38 0.56 (0.50, 0.62)  
Girls
 Age (years) ≥12 127 0.59 (0.53, 0.64) 0.55
< 12 49 0.55 (0.49, 0.61)  
 Number of siblings at birth < 2 69 0.57 (0.52, 0.63) 0.84
≥2 107 0.57 (0.52, 0.63)  
 Maternal Education (years) < 12 90 0.57 (0.51, 0.63) 0.08
12 56 0.63 (0.55, 0.71)  
> 12 30 0.51 (0.46, 0.56)  
 Marital status Married 126 0.57 (0.52, 0.62) 0.68
Other 50 0.58 (0.51, 0.67)  
  1. CI confidence interval
  2. aSpecific gravity-adjusted childhood urinary fluoride