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Table 4 Ratio of geometric means derived from regression models for specific PBDE congeners measured in maternal blood collected upon delivery

From: Predictors of serum concentrations of polybrominated flame retardants among healthy pregnant women in an urban environment: a cross-sectional study

  PBDE 47 PBDE 99 PBDE 100 PBDE 153
# < LOD / Total observationsa 3 / 311 50 / 313 28 / 316 5 / 304
Model distribution General Gamma Log logistic Log logistic General Gamma
  Ratio of geometric means (95% CI) Ratio of geometric means (95% CI) Ratio of geometric means (95% CI) Ratio of geometric means (95% CI)
Race/ethnicity     
 Non Hispanic White 1    
 African-American 1.47 (0.95, 2.29)b    
 Hispanic 1.21 (0.92, 1.57)    
Maternal education     
 Less than high school 1 1   1
 High school or equivalent 1.76 (1.30, 2.37)* 1.39 (0.98, 1.97)b   1.21 (0.92, 1.60)
 College 1.59 (1.20, 2.10)* 1.27 (0.93, 1.73)   1.42 (1.10, 1.83)**
 Graduate 1.45 (0.99, 2.12)b 1.00 (0.69, 1.45)   0.95 (0.67, 1.34)
Household income     
 < $25,000     1
 $25,000 – 50,000     1.22 (0.93, 1.62)
 >$50,000     1.47 (1.15, 1.87)**
Pre-pregnancy BMI     
 Normal     1
 Underweight     0.81 (0.57, 1.16)
 Overweight     0.99 (0.81, 1.21)
 Obese     0.65 (0.50, 0.85)**
Solid Dairy (reference:)     
 < 5 servings per week     1
 5-10 servings per week     1.19 (0.97, 1.47)
 >10 servings per week     1.25 (1.01, 1.56)*
Processed Meat     
 ≤1 serving per week    1 1
 Not reported    1.06 (0.79, 1.40) 1.14 (0.91, 1.44)
 >1 servings per week    1.39 (1.10,1.76)** 1.53 (1.26, 1.86)**
Household electronics     
 < 10 electronics 1 1 1 1
 ≥ 10 electronics 1.70 (1.35, 2.13)** 1.41 (1.12, 1.77)** 1.37 (1.08, 1.74)** 1.32 (1.07, 1.63)**
 Generalized R2 c 12.2% 4.6% 5.7% 24.5%
  1. aSample size for each congener changes due to missing covariates.
  2. b0.05 < p < 0.09, *p < 0.05, ** p < 0.01.
  3. cGeneralized R2 indicates the proportion of variability in the data that is accounted for by the statistical model with multiple predictors.