Table 3.

Urinary concentrations of DAP metabolites ($n=522$).

	Detection rate	Not adjusted for Cr ($\mathrm{\mu }\mathrm{g}/\mathrm{L}$)				Cr-adjusted ($\mathrm{\mu }\mathrm{g}/\mathrm{g}$)
Metabolites	$n$ (%)	25th	50th	75th	95th	25th	50th	75th	95th
DMP	360 (69.0)	$<\text{LOD}$	5.12	20.21	121.92	$<\text{LOD}$	5.36	19.58	123.72
DMTP	436 (83.5)	0.76	1.25	2.42	12.23	0.74	1.37	2.47	11.13
DEP	444 (85.1)	1.13	11.93	43.93	176.82	1.23	10.15	41.06	152.78
DETP	480 (92.0)	0.92	1.68	3.31	14.92	0.92	1.83	3.47	10.25
DMDTP	72 (13.8)	$<\text{LOD}$	$<\text{LOD}$	$<\text{LOD}$	0.76	$<\text{LOD}$	$<\text{LOD}$	$<\text{LOD}$	0.89
DEDTP	10 (1.9)	$<\text{LOD}$	$<\text{LOD}$	$<\text{LOD}$	$<\text{LOD}$	$<\text{LOD}$	$<\text{LOD}$	$<\text{LOD}$	$<\text{LOD}$
${\mathrm{\Sigma }}_4\text{DAP}$a	—	39.32	197.48	605.47	2050.50	47.45	216.67	567.58	1904.24

Note: The LOD were $0.18\mathrm{\mu }\mathrm{g}/\mathrm{L}$ for DMP, $0.3\mathrm{\mu }\mathrm{g}/\mathrm{L}$ for DMTP and DMDTP, $0.06\mathrm{\mu }\mathrm{g}/\mathrm{L}$ for DEP and DETP, and $0.09\mathrm{\mu }\mathrm{g}/\mathrm{L}$ for DEDTP. Cr, creatinine; DAP, dialkylphosphate; DEDTP, diethyldithiophosphate; DEP, diethylphosphate; DETP; diethylthiophosphate; DMDTP, dimethyldithiophosphate; DMP, dimethyl phosphate; DMTP, dimethylthiophosphate; LOD, limits of detection.

^a${\mathrm{\Sigma }}_4\text{DAP}$ was the summary of molar concentrations of DMP, DMTP, DEP, and DETP. The unit for DAPs (not adjusted for Cr) is nmol/L; the unit for DAP (adjusted for Cr) is nmol/g Cr.