Table 2. Results of Fluorine Mass Balance Analysis for Maternal Serum, Placental Tissue, and Cord Serum Samples^a.

sample	total EOF (CIC-EOF)	identified EOF (UPLC-MS/MS-EOF)	unidentified EOF
maternal serum (n > LOQ = 6, total number of samples = 21)	(ng F/mL)	(ng F/mL)	(ng F/mL)
mean (±SD)	3.83 (±1.67)	2.65 (±1.40)	1.17 (±1.66)
median	3.23	2.65	0.64
min	2.85	2.08	0.0
max	7.17	3.11	4.40

sample	total EOF (CIC-EOF)	identified EOF (UPLC-MS/MS-EOF)	unidentified EOF
placental tissue (n > LOQ = 6, total number of samples = 13)	(ng F/g)	(ng F/g)	(ng F/g)
mean (±SD)	1.26 (±0.33)	0.60 (±0.09)	0.66 (±0.26)
median	1.08	0.58	0.55
min	1.02	0.53	0.44
max	1.85	0.77	1.08

sample	total EOF (CIC-EOF)	identified EOF (UPLC-MS/MS-EOF)	unidentified EOF
cord serum (n > LOQ = 7, total number of samples = 11)	(ng F/mL)	(ng F/mL)	(ng F/mL)
mean (±SD)	1.64 (±0.38)	1.49 (±0.46)	0.06 (±0.25)
median	1.80	1.24	0.0
min	1.20	1.18	0.0
max	2.10	2.23	0.60

^aSample sizes are lower compared to that in Section 3.1 since in few samples the EOF concentrations were below the LOQ of the CIC; samples with EOF levels < LOQ were not included; SD = standard deviation.