Table 6.

Individual constant elimination rate (yearly) and half-life (year) in the 17 airport employees for short-chain PFAS.

Subject	Sample counts	PFHxA			PFHpA			PFBS			PFPeS
		Elimination ratea	HLa	$p$-Valuea	Elimination rate	HL	$p$-Value	Elimination rate	HL	$p$-Value	Elimination rate	HL	$p$-Value
1	5	0.2	4.1	0.78	2.1	0.3	0.02	3.2	0.2	0.03	0.7	1.0	0.02
2	5	$-0.1$	NAb	0.87	3.7	0.2	0.01	4.0	0.2	0.02	0.6	1.2	0.04
3	5	1.6	0.4	0.04	1.7	0.4	0.03	5.1	0.1	0.00	0.7	0.9	0.03
4	5	$-0.6$	NA	0.57	3.2	0.2	0.14	3.1	0.2	0.44	0.8	0.8	0.05
5	5	$-1.7$	NA	0.24	1.3	0.5	0.02	3.0	0.2	0.00	0.4	1.7	0.11
6	4	$-1.6$	NA	0.04	4.1	0.2	0.03	2.9	0.2	0.43	0.9	0.7	0.08
7	5	1.5	0.5	0.27	4.6	0.1	0.00	6.2	0.1	0.02	0.7	0.9	0.01
8	5	$-0.7$	NA	0.44	5.4	0.1	0.02	4.4	0.2	0.14	0.5	1.4	0.07
9	5	$-0.2$	NA	0.88	7.8	0.1	0.01	11.7	0.1	0.00	0.7	1.0	0.00
10	5	0.4	1.9	0.75	2.2	0.3	0.04	3.8	0.2	0.03	0.6	1.2	0.08
11	5	2.8	0.2	0.03	2.6	0.3	0.01	7.1	0.1	0.02	2.0	0.3	0.13
12	5	$-0.3$	NA	0.64	6.7	0.1	0.00	5.4	0.1	0.01	1.1	0.6	0.00
13	5	$-0.7$	NA	0.25	5.4	0.1	0.00	6.2	0.1	0.02	0.8	0.9	0.06
14	4	$-0.5$	NA	0.87	6.6	0.1	0.02	10.7	0.1	0.01	1.2	0.6	0.08
15	5	2.7	0.3	0.09	3.9	0.2	0.02	5.7	0.1	0.01	2.5	0.3	0.07
16	5	1.1	0.6	0.08	0.9	0.7	0.17	3.6	0.2	0.01	0.4	1.6	0.07
17	5	2.5	0.3	0.06	5.2	0.1	0.04	10.4	0.1	0.02	2.4	0.3	0.06

Note: HL, half-life; PFBS, perfluorobutane sulfonic acid; PFHpA, perfluoroheptanoic acid; PFHxA, perfluorohexanoic acid; PFPeS, perfluoropentane sulfonic acid.

^aThe elimination rate and $p$-value were obtained from linear regression. Serum PFAS levels were log-transformed. The elimination rate denotes the negative value of the slope ($-\mathrm{\beta }$) from the model, and half-life is calculated as $\text{ln}2/k$.

^bNot applicable because the elimination rate was negative, indicating PFAS levels did not decrease during the 5-month follow-up.