Table 3.
Select percentiles of PFBA concentrations in urine (in μg/L and μg/g creatinine [in italic font]) for the U.S. population ≥6 years of age. Data from the National Health and Nutrition Examination Survey 2013–2014.a
| 90th percentile (95% conf. interval) |
95th percentile (95% conf. interval) |
N | |
|---|---|---|---|
| Total | 0.10 (<LOD, 0.40) | 0.30 (0.10, 0.90) | 2,682 |
| 0.29 (<LOD, 0.42) | 0.44 (0.30, 0.70) | 2,680 | |
| Age group | |||
| 6–11 years | 0.20 (<LOD, 0.50) | 0.30 (<LOD, 0.70) | 409 |
| 0.35 (<LOD, 0.46) | 0.47 (<LOD, 0.63) | 409 | |
| 12+ years | 0.10 (<LOD, 0.40) | 0.30 (<LOD, 1.00) | 2,273 |
| 0.29 (<LOD, 0.44) | 0.44 (<LOD, 0.76) | 2,271 | |
| Sex | |||
| Male | 0.10 (<LOD, 0.50) | 0.30 (0.10, 0.70) | 1,284 |
| 0.22 (<LOD, 0.33) | 0.39 (0.22, 0.61) | 1,283 | |
| Female | 0.10 (<LOD, 0.40) | 0.30 (<LOD, 1.20) | 1,398 |
| 0.33 (<LOD, 0.50) | 0.50 (<LOD, 0.78) | 1,397 | |
| Race | |||
| All Hispanic | <LOD | 0.20 (<LOD, 0.30) | 690 |
| <LOD | 0.33 (<LOD, 0.44) | 690 | |
| Non-Hispanic white | 0.20 (<LOD, 0.60) | 0.40 (0.10, 1.20) | 987 |
| 0.35 (<LOD, 0.54) | 0.49 (0.33, 0.87) | 986 | |
| Non-Hispanic black | <LOD | 0.10 (<LOD, 0.50) | 608 |
| <LOD | 0.24 (<LOD, 0.33) | 608 | |
| Asian | 0.10 (<LOD, 0.30) | 0.20 (<LOD, 1.60) | 287 |
| 0.27 (<LOD, 0.37) | 0.37 (<LOD, 0.50) | 286 | |
| Mexican American | <LOD | 0.10 (<LOD, 0.20) | 438 |
| <LOD | 0.30 (<LOD, 0.39) | 438 |
b
<LOD means that concentrations were below the limit of detection (LOD) of 0.1 μg/L.