Table S3: Accuracy, precision and 95% confidence intervals of PFASs in NIST SRM 1957 for each sampling group 2001-2004 (70 yr. old) 2006-2009 (75 yr. old) 2011-2014 (80 yr. old) NIST *Riddell et al. 2009 n=56 n=54 n=46 reference mean mean mean mean concentration Analyte concentration concentration (ng/mL) concentration (ng/mL) concentration (ng/mL) (95% CI) (ng/mL) PFHpA 0.23 (±0.01) 0.27 (±0.01) 0.26 (±0.01) 0.31 (±0.04) N/A PFOA 4.2 (±0.06) 4.6 (±0.12) 4.5 (±0.04) 5.0 (±0.40) N/A PFNA 0.74 (±0.01) 0.81 (±0.02) 0.83 (±0.01) 0.88 (±0.07) N/A PFDA 0.28 (±0.01) 0.28 (±0.01) 0.25 (±0.01) 0.39 (±0.10) N/A PFUnDA 0.18 (±0.03) 0.23 (±0.03) 0.19 (±0.01) 0.17 (±0.03) N/A PFHxS 3.4 (±0.04) 3.6 (±0.09) 3.5 (±0.02) 4.0 (±0.75) N/A L-PFOS 11 (±0.16) 11 (±0.29) 11 (±0.48) N/A 10.6 (±2.86) *PFOS and PFOS isomers were not reported in the NIST reference. Therefore, the linear PFOS isomer (L-PFOS) levels detected in the NIST samples were compared to previously reported independent values (Riddellet al. 2009)
Table S3: Accuracy, precision and 95% confidence intervals of PFASs in NIST SRM 1957 for each sampling group 2001-2004 (70 yr. old) n=56 2006-2009 (75 yr. old) n=54 2011-2014 (80 yr. old) n=46 NIST *Riddell et al. 2009 Analyte mean concentration (ng/mL) mean concentration (ng/mL) mean concentration (ng/mL) reference concentration (ng/mL) mean concentration (95% CI) PFHpA 0.23 (±0.01) 0.27 (±0.01) 0.26 (±0.01) 0.31 (±0.04) N/A PFOA 4.2 (±0.06) 4.6 (±0.12) 4.5 (±0.04) 5.0 (±0.40) N/A PFNA 0.74 (±0.01) 0.81 (±0.02) 0.83 (±0.01) 0.88 (±0.07) N/A PFDA 0.28 (±0.01) 0.28 (±0.01) 0.25 (±0.01) 0.39 (±0.10) N/A PFUnDA 0.18 (±0.03) 0.23 (±0.03) 0.19 (±0.01) 0.17 (±0.03) N/A PFHxS 3.4 (±0.04) 3.6 (±0.09) 3.5 (±0.02) 4.0 (±0.75) N/A L-PFOS 11 (±0.16) 11 (±0.29) 11 (±0.48) N/A 10.6 (±2.86) *PFOS and PFOS isomers were not reported in the NIST reference. Therefore, the linear PFOS isomer (L-PFOS) levels detected in the NIST samples were compared to previously reported independent values (Riddellet al. 2009)
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