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Table 1 Selected participant characteristics and unadjusted percent difference in urinary flame retardant metabolite concentrations as a function of sociodemographic predictors

From: Variability and predictors of urinary concentrations of organophosphate flame retardant metabolites among pregnant women in Rhode Island

 

n

Mean ± SD

Urinary flame retardant metabolites during pregnancya

(%)

BCEP

BDCPP

DPhP

Characteristics

  

% diff (95% CI)

% diff (95% CI)

% diff (95% CI)

Maternal Age (years)

52

29.5 ± 4.5

−3.2 (−10.2, 4.2)

−4.9 (−9.7, 0.1)*

−1.4 (−5.2, 2.5)

Maternal Weight (kg)

56

74.7 ± 20.0

0.9 (0.0, 1.9)*

1.3 (0.1, 2.5)**

0.5 (−0.1, 1.1)

Maternal BMI (kg/m2)

56

27.7 ± 6.8

1.7 (−1.5, 5.0)

3.5 (0.2, 6.9)**

1.5 (−0.2, 3.3)*

Maternal Raceb

 Non-Hispanic White

35

(59)

0 (reference)

0 (reference)

0 (reference)

 Other

20

(34)

9.1 (−34.4, 81.2)

40.5 (−10.2, 119.9)

10 (−20.7, 52.6)

Maternal Educationc

 High School or Less

16

(27)

0 (reference)

0 (reference)

0 (reference)

 Tech school/Some College

16

(27)

1.3 (−53.2, 119.6)

−40.7 (−65.7, 2.8)*

−1.1 (−35.4, 51.6)

 Bachelor's/Graduate/Professional

26

(44)

−30.3 (−68.2, 52.9)

−47.1 (−67.8, −13.3)**

−4.0 (−36.2, 44.4)

   

p-trend = 0.30

p-trend = 0.02

p-trend = 0.83

Household Incomec

 <$25,000

20

(34)

0 (reference)

0 (reference)

0 (reference)

 $25,000–100,000

20

(34)

−6.5 (−51.2, 79.2)

−41.3 (−64.2, −3.8)**

−6.3 (−35.1, 35.4)

 >$100,000

18

(31)

−29.9 (−63.1, 33.3)

−42.8 (−64.6, −7.6)**

−10.2 (−35.8, 25.6)

   

p-trend = 0.27

p-trend = 0.02

p-trend = 0.52

Parityd

 Nulliparous

23

(39)

0 (reference)

0 (reference)

0 (reference)

 Parous

32

(54)

−1.0 (−41.5, 67.7)

31.2 (−16.6, 106.3)

1.6 (−26.3, 40.0)

  1. BMI Body Mass Index, SD Standard deviation, *p < 0.10, **p < 0.05
  2. a Percent difference calculated from linear mixed models using the individual sociodemographic factor of interest to predict repeated measurements at 12, 28, and 35 weeks’ gestation of log(2)-transformed specific gravity standardized concentration of each urinary flame retardant metabolite adjusted for gestational week of urine sample
  3. b Missing n = 4
  4. c Missing n = 1
  5. d Missing n = 4