Table 4.

Change in Geometric Mean PFAS Serum Concentrations from 2010 to 2016 (n =45) in the vicinity of Decatur, AL.

PFAS	Absolute change (μg/L)	Percentage change (%)	Two-tailed P-value, Student’s t-test
PFOA	−11.2	−49%	1.0 × 10−5
PFOS	−26.7	−53%	1.0 × 10−5
PFHxS	−0.9	−11%	0.37
PFNA	−1.0	−58%	1.0 × 10−9
PFDeA	−0.2	−43%	1.0 × 10−4
Me-PFOSA-AcOH	−0.2	−60%	1.0 × 10−4
Et-PFOSA-AcOH	a	a	a
PFOSA	a	a	a

Changes calculated as PFAS₂₀₁₆ − PFAS₂₀₁₀. Time period is 2095 days.

^aNot calculated, proportion of results below limit of detection was too high to provide a valid result.