Table 1.

Distributions of prenatal PFAS levels, LOD for each PFAS, and number (%) of samples below LOD for Project Viva participants included in this analysis ($n=545$).

PFAS (ng/mL)	Minimum	Percentile			Maximum	LOD (ng/mL)	Samples $<\text{LOD}$ [$n$ (%)]
		25th	50th	75th
PFOS	5.30	18.00	24.70	33.80	134.00	0.20	0 (0.0)
PFOA	0.80	3.90	5.40	7.60	49.30	0.10	0 (0.0)
PFHxS	0.07	1.50	2.30	3.60	43.20	0.10	6 (1.1)
PFNA	0.07	0.50	0.70	0.90	3.40	0.10	7 (1.3)
EtFOSAA	0.07	0.70	1.10	1.80	19.40	0.10	3 (0.6)
MeFOSAA	0.10	1.20	1.90	2.90	29.70	0.10	0 (0.0)

Note: Samples were collected between April 1999 and July 2002. We imputed PFAS concentrations below the LOD with the LOD divided by the square root of 2. Distributions of PFAS levels in this table are after imputation and before ${\log }_2$-transformation. Distributions of PFAS levels after ${\log }_2$-transformation are provided in Table S2. Histograms that show the distributions of these PFAS before and after ${\log }_2$-transformation are provided in Figure S2. EtFOSAA, 2-($N$-ethyl-perfluorooctane sulfonamido) acetate; LOD, limit of detection; MeFOSAA, 2-($N$-methyl-perfluorooctane sulfonamido) acetate; PFAS, per- and polyfluoroalkyl substances; PFHxS, perfluorohexane sulfonate; PFNA, perfluorononanoate; PFOA, perfluorooctanoate; PFOS, perfluorooctane sulfonate.