Table 3.

Distribution of chemical levels (ng/mL) in maternal serum ($n=302$) and cord blood ($n=299$).

Chemical	Sample	LOD	DF (%)	GM	GSD	Min	Max	Percentile
								25	50	75	95
Branched PFOS (ratio GM maternal/cord: 1.5)a
	Cord	NR	NR	0.2	2.4	0	1.3	0.1	0.2	0.3	0.6
	Maternal	NR	NR	0.3	2	0	3	0.2	0.3	0.5	1
Linear PFOS (ratio GM maternal/cord: 1.8)
	Cord	0.43	67	0.6	1.6	$<\text{LOD}$	3.8	$<\text{LOD}$	0.5	0.8	1.4
	Maternal	0.43	97	1.1	1.8	$<\text{LOD}$	6.7	0.7	1	1.6	3.1
PFHxS (ratio GM maternal/cord: 1.3)
	Cord	0.11	98	0.3	1.6	$<\text{LOD}$	2.6	0.2	0.3	0.4	0.7
	Maternal	0.11	100	0.4	1.8	$<\text{LOD}$	4.2	0.3	0.4	0.5	1.1
Tridecanedioic acid (ratio GM maternal/cord: 0.7)
	Cord	6.79	86	11.2	1.6	$<\text{LOD}$	47.7	8.1	11.2	14.9	23.7
	Maternal	6.79	67	7.7	1.5	$<\text{LOD}$	26.2	6.3	8.1	9.9	14
Octadecanedioic acid (ratio GM maternal/cord: 4.4)
	Cord	0.48	100	3.1	1.8	0.5	35.7	2.2	3	4.3	9.2
	Maternal	0.48	100	13.6	2	1.9	102.8	8.6	13.6	21.8	40.3
Deoxycholic acid (ratio GM maternal/cord: 4.4)
	Cord	0.81	99	3.7	2.2	$<\text{LOD}$	54.4	2.2	3.2	5.7	15.3
	Maternal	0.81	99	16.1	3.4	$<\text{LOD}$	432.6	7.5	16.5	37.1	104.8
Monoethylhexyl phthalate (ratio GM maternal/cord: NA)
	Cord	5.19	58	6.7	2.7	$<\text{LOD}$	136.1	$<\text{LOD}$	6	10.7	50.4
	Maternal	5.19	44	$<\text{LOD}$	$<\text{LOD}$	$<\text{LOD}$	452.6	$<\text{LOD}$	$<\text{LOD}$	16	60.2
Tetraethylene glycol (ratio GM maternal/cord: 1.0)
	Cord	2.1	43	3	3.1	$<\text{LOD}$	358	$<\text{LOD}$	$<\text{LOD}$	4.7	35.3
	Maternal	2.1	43	2.9	2.9	$<\text{LOD}$	226.2	$<\text{LOD}$	$<\text{LOD}$	5	24.3
4-Nitrophenol (ratio GM maternal/cord: NA)
	Cord	0.67	17	$<\text{LOD}$	1.5	$<\text{LOD}$	1.6	$<\text{LOD}$	$<\text{LOD}$	$<\text{LOD}$	0.9
	Maternal	0.67	27	$<\text{LOD}$	1.6	$<\text{LOD}$	2.5	$<\text{LOD}$	$<\text{LOD}$	0.7	1

Note: The sample size is smaller for cord blood samples because we were not able to collect cord blood from a small number of participants. DF, detection frequency; GM, geometric mean; GSD, geometric standard deviation; LOD, limit of detection; Max, maximum; Min, minimum; NA, not applicable; NR, not reportable; PFHxS, perfluorohexane sulfonate; PFOS, perfluorooctane sulfonate.

^aThe LOD and DF for branched PFOS were not reportable because they were estimated by subtracting the levels of linear PFOS from the total PFOS. Maternal/cord ratio illustrates transfer efficiency between maternal and cord matrices and was calculated by GM(Maternal)/GM(Cord). Summary statistics were calculated for each analyte in the full sample for cord and maternal serum.