Table 3.

Distributions of dilution-standardized urinary OPE biomarker concentrations among 6,646 ECHO pregnant participants.

OPE biomarkers	LOD (ng/mL)	$n$ (%) $>\text{LOD}$	Percentile
			5th	25th	50th	75th	95th
DPHP	0.03	6,613 (99.5)	0.26	0.54	0.92	1.78	8.33
DBUP/DIBP	0.04	6,343 (95)	0.06	0.12	0.19	0.30	0.88
BDCPP	0.02	5,784 (87)	$<\text{LOD}$	0.31	0.86	1.70	5.02
BCETP	0.02	4,589 (69)	$<\text{LOD}$	$<\text{LOD}$	0.52	1.58	8.22
BBOEP	0.02	4,398 (66)	$<\text{LOD}$	$<\text{LOD}$	0.05	0.09	0.25
BCPP	0.02	3,494 (53)	$<\text{LOD}$	$<\text{LOD}$	0.12	0.75	3.45
BMPP	0.01	2,383 (36)	$<\text{LOD}$	$<\text{LOD}$	$<\text{LOD}$	0.03	0.13
BEHP	0.02	1,963 (30)	$<\text{LOD}$	$<\text{LOD}$	$<\text{LOD}$	0.04	0.55
DPRP	0.03	1,690 (25)	$<\text{LOD}$	$<\text{LOD}$	$<\text{LOD}$	0.03	0.31

Note: BBOEP, bis(butoxyethyl) phosphate; BCETP, bis(2-chloroethyl) phosphate; BCPP, bis(1-chloro-2-propyl) phosphate; BDCPP, bis(1,3-dichloro-2-propyl) phosphate; BEHP, bis(2-ethylhexyl) phosphate; BMPP, bis(2-methylphenyl) phosphate; DBUP/DIBP, composite of dibutyl phosphate and di-isobutyl phosphate; DPHP, diphenyl phosphate; DPRP, dipropyl phosphate; ECHO, Environmental influences on Child Health Outcomes; LOD, limit of detection; OPE, organophosphate ester.