Table 1.

Study Population Characteristics

CharacteristicsValue
Male sex, n (%)688 (51.7)
Mean age (SE)13.0 (0.1)
Race/ethnicity
 Hispanic-Mexican American, n (%)316 (13.2)
 Hispanic-Other Hispanic, n (%)152 (6.8)
 Non-Hispanic White, n (%)375 (56.4)
 Non-Hispanic Black, n (%)329 (14.4)
 Other, n (%)157 (9.2)
Poverty–income ratio
 First quartile (<0.83), n (%)273 (13.4)
 Second quartile (0.83–1.59), n (%)303 (16.2)
 Third quartile (1.60–3.09), n (%)314 (23.8)
 Fourth quartile (at least 3.1), n (%)326 (37.5)
 Missing113 (9.1)
Serum cotinine
 <0.015 ng/mL, n (%)307 (21.4)
 0.015–1.9 ng/mL, n (%)734 (56.0)
 At least 2.0 ng/mL, n (%)149 (12.1)
 Missing139 (10.5)
Physical activity ≥60 min/d, n (%)214 (18.3)
Missing1109 (81.1)
Excessive caloric intake compared with active child needs for age and sex, n (%)311 (22.1)
Missing51 (2.3)
Blood pressure at least 90th percentile, n (%)89 (5.3)
Overweight, n (%)522 (37.5)
Obese, n (%)283 (18.4)
Low molecular weight phthalate metabolite, median concentration (IQR)0.443 μmolar (0.214, 0.997)
High molecular weight phthalate metabolite, median concentration (IQR)0.352 μmolar (0.173, 0.677)
DEHP metabolite, median concentration (IQR)0.157 μmolar (0.077, 0.313)
DIDP metabolite, median concentration (IQR)0.009 μmolar (0.005, 0.016)
DINP metabolite, median concentration (IQR)0.071 μmolar (0.034, 0.174)
  • All percentages are weighted using population weights for the sample in which phthalate metabolites were measured. DEHP indicates di-2-ethylhexylphthalate; DIDP, di-isodecyl phthalate; DINP, di-isononyl phthalate; and IQR, interquartile range.