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Table 2 Urine bisphenol A (BPA) concentrations (ng/mL) and daily intake estimates (μg/day) among study participants

From: Association between bisphenol A exposure and body mass index in Chinese school children: a cross-sectional study

  Group  Geometric mean (95%CI)    Percentile (not corrected by SG) p-Value
   Corrected by SG Not corrected by SG Minimum 25% 50% 75% Maximum  
Urine BPA All 0.40 (0.33, 0.49) 0.45 (0.37, 0.55) 0.05 0.2 0.6 1.37 16.3  
Daily intake estimate All 0.33 (0.27, 0.41) 0.37 (0.29,0.45) 0.03 0.12 0.48 1.26 1.96  
  Age (years)         
Urine BPA 8-11 0.32 (0.25, 0.43) 0.31 (0.23, 0.41) 0.05 0.1 0.35 1.05 14.00 P<0.001a
  12-15 0.53 (0.40, 0.70) 0.72 (0.54, 0.94) 0.05 0.35 0.85 1.91 16.3  
Daily intake estimate 8-11 0.19 (0.15, 0.25) 0.19 (0.14,0.24) 0.03 0.06 0.21 0.63 8.64 P<0.001a
  12-15 0.63 (0.48, 0.84) 0.86 (0.65,1.13) 0.06 0.42 1.02 2.30 19.56  
  Sex         
Urine BPA Female 0.43 (0.33, 0.58) 0.46 (0.35, 0.63) 0.05 0.2 0.55 1.48 16.30 P = 0.812b
  Male 0.38 (0.29, 0.50) 0.43 (0.33, 0.58) 0.05 0.2 0.63 1.2 10.90  
Daily intake estimate Female 0.35 (0.26, 0.48) 0.38 (0.28,0.52) 0.03 0.12 0.48 1.47 19.56 P = 0.939b
  Male 0.31 (0.23, 0.41) 0.35 (0.26,0.48) 0.03 0.15 0.48 1.20 13.08  
  BMI         
Urine BPA Normal weight 0.33 (0.25, 0.45) 0.33 (0.25, 0.45) 0.05 0.1 0.35 1.05 14.40 P = 0.018c
  Overweight 0.37 (0.24, 0.58) 0.47 (0.30, 0.74) 0.05 0.16 0.78 1.35 11.00  
  Obesity 0.57 (0.42, 0.78) 0.68 (0.49, 0.95) 0.05 0.35 0.78 1.79 16.30  
Daily intake estimate Normal weight 0.26 (0.19, 0.36) 0.26 (0.19,0.36) 0.03 0.06 0.30 1.08 10.26 P = 0.032c
  Overweight 0.33 (0.20, 0.53) 0.41 (0.25,0.69) 0.03 0.13 0.56 1.49 13.20  
  Obesity 0.47 (0.34, 0.65) 0.56 (0.40,0.80) 0.03 0.29 0.66 1.59 19.56  
  1. Abbreviation: CI (confidence interval), SG (specific gravity).
  2. a Analysis of variance for urine BPA and daily intake estimate uncorrected by SG adjusted for sex.
  3. b Analysis of variance for urine BPA and daily intake estimate uncorrected by SG adjusted for age.
  4. c Analysis of variance for urine BPA and daily intake estimate uncorrected by SG adjusted for age and sex.