Table 2.
PFAS concentrations in H3Africa and NHANES cohorts
| Chemical | H3Africa data 2013−2017 (ng/ml) N = 81 |
NHANES data 2013−16 (ng/ml) N = 4158 |
||
|---|---|---|---|---|
| Median (IQR) | % Detection | Median (IQR) | % Detection | |
| PFOS | 1.9 (0.8, 2.9) | 92.6 | 3.3 (1.9, 5.9)a | 99.3 |
| PFOA | 0.4 (0.2, 0.6) | 87.7 | 1.6 (1.0, 2.5)a | 99.2 |
| PFHxS | 0.2 (0.1, 0.4) | 82.7 | 1.2 (0.7, 2.2)a | 98.7 |
| PFHxA | 0.2 (0.1, 0.4) | 69.1 | — | — |
| PFNA | 0.1 (0.1, 0.3) | 46.9 | 0.6 (0.4, 1.0)a | 98.8 |
| PFDA | 0.2 (0.1, 0.2) | 87.7 | 0.2 (0.07, 0.3) | 72.8 |
IQR, interquartile range; LOD, limit of detection; NHANES, National Health and Nutrition Survey; PFAS, perfluoroalkyl substances; PFOA, perfluorooctanoic acid; PFOS, perfluorooctane sulfonic acid; PFHxA, perflourohexanoic acid; PFHxS, perfluorohexane sulfonate; PFDA, perflourodecanoic acid; PFNA, perfluorononanoic acid.
PFOS LOD, 0.2 ng/ml; PFOA LOD, 0.08 ng/ml; PFHxS LOD, 0.08 ng/ml; PFHxA LOD, 0.08 ng/ml; PFNA LOD, 0.2 ng/ml; PFDA LOD: 0.08 ng/ml. PFHxA measurements were not included in NHANES data.
a
P < 0.0001 versus H3Africa. Median and IQR were converted to mean ± SD, and the levels in the 2 groups were compared with a t-test.