Table 3. Relative differences between PFAA concentrations in 21 paired blood samples that were collected during the summer and transported after a processing delay or only had delayed processing without transport.
| PFAA | Median1 | Median2 | Relative difference (95% CI) |
|---|---|---|---|
| (ng/mL) | (ng/mL) | (%) | |
| PFUnA | 0.5 | 0.5 | -3 (-8, 2) |
| PFDA | 0.4 | 0.4 | -3 (-7, 1) |
| PFHpS | 0.3 | 0.3 | -2 (-8, 6) |
| PFOS | 17.1 | 16.1 | -2 (-5, 1) |
| PFNA | 0.8 | 0.8 | 0 (-3, 2) |
| PFOA | 2.5 | 2.6 | -1 (-3, 1) |
| PFHxS | 0.7 | 0.6 | -2 (-6, 3) |
| PFHpA | 0.1 | 0.1 | -9 (-16, -1) |
PFAA: Perfluoroalkyl acid
for specific PFAA abbreviations see Table 1. Median1 refers to delayed and transported samples. Median2 corresponds to samples that were only delayed.