Perfluoroalkyl substances exposure in early pregnancy and preterm birth in singleton pregnancies: a prospective cohort study

Table 2 The distribution of plasma concentrations of PFAS (ng/mL) at the enrollment (n = 2849)

PFAS	LOD	% < LOD	25th percentile	Median	75th percentile
PFOA	0.09	0	9.20	11.85	15.26
PFOS	0.09	0	6.54	9.33	13.65
PFDA	0.02	0	1.14	1.69	2.52
PFUA	0.02	0	0.94	1.39	2.05
PFNA	0.02	0	1.21	1.69	2.36
PFHxS	0.02	0	0.42	0.54	0.69
PFHpA	0.03	17.4	0.04	0.06	0.10
PFBS	0.009	18.8	0.02	0.04	0.06
PFDoA	0.05	16.9	0.10	0.16	0.25
PFOSA	0.12	80.4	–	–	–

Note: LOD limit of dection, PFOA perfluorooctanate, PFOS perfluorooctane sulfonate, PFDA perfluorodecanoic acid, PFUA perfluoroundecanoic acid, PFNA perfluorononanoic acid, PFHxS perfluorohexanesulfonate, PFHpA perfluoroheptanoic acid, PFBS perfluorobutane sulfonate, PFDoA perfluorododecanoic acid, PFOSA perfluorooctane sulfonamide

ISSN: 1476-069X