Table 2.

Distribution of serum concentrations (ng/mL) of the twelve measured PFAS congeners and percentage of samples above the LOQ in the study population (18,345 subjects 14–39 years of age).

Congener	Min	5th percentile	25th percentile	Median	75th percentile	95th percentile	Max	% samples $\ge \mathrm{L}\mathrm{O}\mathrm{Q}$
PFBA	$<0.5$	$<0.5$	$<0.5$	$<0.5$	$<0.5$	$<0.5$	23.9	2.0%
PFPeA	$<0.5$	$<0.5$	$<0.5$	$<0.5$	$<0.5$	$<0.5$	1.3	0.1%
PFHxA	$<0.5$	$<0.5$	$<0.5$	$<0.5$	$<0.5$	$<0.5$	7.1	0.3%
PFHpA	$<0.5$	$<0.5$	$<0.5$	$<0.5$	$<0.5$	$<0.5$	15.1	1.4%
PFOA	$<0.5$	5.1	19.3	44.4	84.9	189.7	1,400.0	99.9%
PFNA	$<0.5$	$<0.5$	$<0.5$	0.5	0.6	1.0	39.7	51.3%
PFDeA	$<0.5$	$<0.5$	$<0.5$	$<0.5$	$<0.5$	0.8	8.3	22.0%
PFUnA	$<0.5$	$<0.5$	$<0.5$	$<0.5$	$<0.5$	0.5	6.0	6.3%
PFDoA	$<0.5$	$<0.5$	$<0.5$	$<0.5$	$<0.5$	$<0.5$	4.5	0.8%
PFBS	$<0.5$	$<0.5$	$<0.5$	$<0.5$	$<0.5$	$<0.5$	8.9	3.1%
PFHxS	$<0.5$	0.7	1.9	3.9	7.4	18.1	127.0	98.1%
PFOS	$<0.5$	1.4	2.6	3.9	5.8	10.7	142.0	99.8%

Note: LOQ, limit of quantification; Max, maximum; Min, minimum; PFBA, perfluorobutanoic acid; PFBS, perfluorobutanesulfonic acid; PFDeA, perfluorodecanoic acid; PFDoA, perfluorododecanoic acid; PFHpA, perfluoroheptanoic acid; PFHxA, perfluorohexanoic acid; PFHxS, perfluorohexanesulfonic acid; PFNA, perfluorononanoic acid; PFOA, perfluorooctanoic acid; PFOS, perfluorooctanesulfonic acid; PFPeA, perfluoropentanoic acid; PFUnA, perfluoroundecanoic acid.