Table 1.

Perfluoroalkyl acid abbreviations, limits of quantification (LOQ), levels above the LOQ, and exposure distributions for included compounds measured in 1,507 serum samples from the Aarhus Birth Cohort, 2008–2013.

Full name of PFAA	Abbreviation	LOQ	% above LOQ	Median (IQR)	Quartile 1	Quartile 2	Quartile 3	Quartile 4
Perfluorohexane sulfonate	PFHxS	0.08	99.9	0.5 (0.4–0.6)	< LOQ–0.36	0.37–0.47	0.48–0.63	0.64–6.82
Perfluoroheptane sulfonate	PFHpS	0.11	76	0.2 (0.1–0.2)	< LOQ–0.11	0.12–0.16	0.17–0.21	0.22–1.16
Perfluorooctane sulfonate	PFOS	0.28	99.9	8.3 (6.0–10.8)	< LOQ–6.02	6.03–8.29	8.30–10.80	10.81–36.10
Perfluorooctanoic acid	PFOA	0.20	99.9	2.0 (1.5–2.6)	< LOQ–1.53	1.54–2.02	2.03–2.64	2.65–15.10
Perfluorononanoic acid	PFNA	0.27	99	0.8 (0.6–1.0)	< LOQ–0.60	0.61–0.75	0.76–0.97	0.98–4.69
Perfluorodecanoic acid	PFDA	0.09	99	0.3 (0.2–0.4)	< LOQ–0.24	0.25–0.31	0.32–0.42	0.43–2.87
Perfluoroundecanoic acid	PFUnA	0.15	87	0.3 (0.2–0.4)	< LOQ–0.20	0.21–0.29	0.30–0.44	0.44–2.47
Abbreviations: IQR, Interquartile range; PFAA, perfluoroalkyl acid. All concentrations are in nanograms per milliliter.