Table 2.

Distributions of PFAS concentrations in 551 child serum samples.

PFAS a	LOD (ng/mL)	% detect	50th (5th, 95th) percentiles (ng/mL)					p-value (vs. TD) b
			All (n = 551)	TD (n = 180)	ASD (n = 190)	DD (n = 103)	OEC (n = 78)	ASD	DD	OEC
PFOA	0.05	100	2.36 (0.93, 6.77)	2.58 (1.14, 6.50)	2.20 (0.91, 6.30)	2.22 (0.90, 9.45)	2.13 (0.90, 6.31)	0.01	0.10	0.13
PFOS	0.02	100	2.45 (0.93, 11.0)	2.58 (1.13, 10.7)	2.01 (0.81, 8.01)	2.62 (0.86, 11.0)	2.90 (0.99, 13.6)	<0.01	0.35	0.99
PFHxS	0.02	100	0.64 (0.24, 3.41)	0.72 (0.28, 3.07)	0.59 (0.20, 3.05)	0.59 (0.23, 3.48)	0.71 (0.24, 4.24)	0.01	0.14	0.98
PFNA	0.02	100	0.85 (0.29, 2.60)	0.92 (0.41, 3.24)	0.71 (0.26, 2.49)	0.92 (0.33, 2.49)	0.93 (0.29, 2.42)	<0.01	0.99	0.33
PFDA	0.02	99.6	0.16 (0.07, 0.48)	0.17 (0.08, 0.50)	0.14 (0.06, 0.49)	0.15 (0.07, 0.44)	0.15 (0.07, 0.34)	<0.01	0.06	0.02
PFPeA	0.05	99.3	0.57 (0.22, 1.25)	0.56 (0.22, 1.14)	0.51 (0.20, 1.33)	0.62 (0.24, 1.44)	0.65 (0.22, 1.17)	0.67	0.02	0.04
PFHpA	0.02	96.0	0.20 (0.03, 0.87)	0.22 (0.04, 0.72)	0.23 (0.03, 1.00)	0.16 (0.02, 0.86)	0.18 (<LOD, 1.04)	0.65	0.04	0.02
PFUnDA	0.02	74.6	0.04 (<LOD, 0.15)	0.05 (<LOD, 0.16)	0.03 (<LOD, 0.13)	0.04 (<LOD, 0.13)	0.04 (<LOD, 0.18)	<0.01	0.06	0.03
PFBS	0.02	29.6	<LOD (<LOD, 0.07)	<LOD (<LOD, 0.06)	<LOD (<LOD, 0.10)	<LOD (<LOD, 0.06)	<LOD (<LOD, 0.06)	-	-	-
PFHxA	0.05	16.2	<LOD (<LOD, 0.28)	<LOD (<LOD, 0.24)	<LOD (<LOD, 0.43)	<LOD (<LOD, <LOD)	<LOD (<LOD, 0.15)	-	-	-
MeFOSAA	0.02	81.1	0.12 (<LOD, 1.64)	0.12 (<LOD, 1.45)	0.10 (<LOD, 1.56)	0.14 (<LOD, 2.26)	0.13 (<LOD, 2.14)	0.06	0.24	0.66
EtFOSAA	0.02	17.1	<LOD (<LOD, 0.07)	<LOD (<LOD, 0.07)	<LOD (<LOD, 0.06)	<LOD (<LOD, 0.07)	<LOD (<LOD, 0.10)	-	-	-

^aPFDoDA and PFOSA, which were detected in 4.2% and 0.7% of the samples, respectively, were excluded from the table

^bP-values from the Wilcoxon rank-sum test were not calculated for PFAS that were detected in less than 30% of the samples.