Table 2.

Descriptive statistics of creatinine-adjusted phthalate and bisphenol concentrations in urine samples measured in pregnancy.

Variables	$n$	Min	P25	P50	P75	Max
Phthalate metabolite concentrations ($\mathrm{\mu }\mathrm{g}/\mathrm{g}\text{\hspace{0.17em}creatinine}$)a
LMWP metabolites (weeks of gestation)
$<18$	1,274	0.4	109.5	239.5	603.3	102,789.2
18–25	1,270	4.3	46.8	102.6	238.0	36,050.2
$>25$	1,269	21.1	103.0	232.3	530.5	8,131.3
HMWP metabolites (weeks of gestation)
$<18$	1,274	0.6	39.6	68.5	126.6	2,837.4
18–25b	1,270	2.3	19.3	33.1	59.0	15,577.1
$>25$b	1,269	3.6	35.0	52.3	81.9	1,683.6
DEHP metabolites (weeks of gestation)
$<18$	1,274	0.3	31.4	55.2	103.0	2,821.2
18–25	1,270	1.8	14.4	25.0	46.3	15,574.4
$>25$	1,269	3.2	29.6	45.0	71.0	1,673.5
DNOP metabolites (weeks of gestation)
$<18$	1,274	0	0.9	1.6	2.8	106.5
18–25	1,270	0	0.4	0.8	1.4	65.8
$>25$	1,269	0	1.2	1.9	3.0	72.0
PA (weeks of gestation)
$<18$	1,274	0.6	33.8	63.8	123.4	12,433.4
18–25	1,270	4.3	56.5	111.6	250.1	2,885.2
$>25$	1,269	2.6	44.2	73.9	127.1	1,562.4
Total bisphenol concentrations [weeks of gestation ($\mathrm{\mu }\mathrm{g}/\mathrm{g}\text{\hspace{0.17em}creatinine}$)]
$<18$c	1,274	0.1	1.0	2.1	5.2	982.8
18–25d	1,270	0	0.6	1.2	2.5	277.6
$>25$e	1,269	0.1	1.1	2.0	4.2	145.4

Note: Concentrations below the LOD were imputed with LOD divided by the square root of 2. DEHP, di-2-ethylhexylphthalate metabolite; DNOP, di-n-octylphthalate metabolite; HMWP, high-molecular weight phthalate metabolite; LMWP, low-molecular weight phthalate metabolite; LOD, limit of detection; max, maximum; min, minimum; P, percentile; PA, phthalic acid.

^aPhthalate metabolites are grouped into the following categories: LMWP metabolites (sum of mono-methyl phthalate, mono-ethyl phthalate, mono-isobutyl phthalate, and mono-$n$-butyl phthalate); HMWP metabolites [sum of mono-(2-ethyl-5-carboxypentyl) phthalate, mono-(2-ethyl-5-hydroxyhexyl) phthalate, mono-(2-ethyl-5-oxohexyl) phthalate, mono-[(2-carboxymethyl)hexyl] phthalate, mono(3-carboxypropyl) phthalate, monobenzyl phthalate, mono-hexyl phthalate, and mono-2-heptyl phthalate; DEHP metabolites: [sum of mono (2-ethyl-5 carboxypentyl)phthalate, mono (2-ethyl-5 hydroxyhexyl)phthalate, mono-(2-ethyl-5-oxohexyl)phthalate, and mono-[(2-carboxymethyl)hexyl]phthalate]; DNOP metabolites [mono(3-carboxypropyl) phthalate]; and PA (a proxy for total phthalate exposure).

^bWith the exclusion of mono-hexyl phthalate, and mono-2-heptyl phthalate metabolite concentrations.

^cTotal bisphenol: sum of bisphenol A, bisphenol F, and bisphenol S.

^dTotal bisphenol: sum of bisphenol A and bisphenol S.

^eTotal bisphenol: sum of bisphenol A and bisphenol F.