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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.