# Results

## Chemical Group:Perfluoroalkyl and Polyfluoroalkyl Substances (PFASs)

• Measured in: Serum

### Project: Asian/Pacific Islander Community Exposures (ACE) Project - ACE 1

95% Confidence Interval Selected Percentiles
Chemical measured Indicates exposure to Units Number of people tested Geometric mean Lower Upper 25th 50th 75th 90th Detection frequency Limit of Detection (LOD), wet-weight
PFOS PFOS ng/ml 96 6.51 5.49 7.73 3.32 6.05 11.7 19.3 100% 0.0566

### Project: Asian/Pacific Islander Community Exposures (ACE) Project - ACE 2

95% Confidence Interval Selected Percentiles
Chemical measured Indicates exposure to Units Number of people tested Geometric mean Lower Upper 25th 50th 75th 90th Detection frequency Limit of Detection (LOD), wet-weight
PFOS PFOS ng/ml 99 7.47 6.38 8.75 4.17 7.00 11.5 22.9 100% 0.191

### Project: Biomonitoring Exposures Study (BEST) - 1.Pilot

95% Confidence Interval Selected Percentiles
Chemical measured Indicates exposure to Units Number of people tested Geometric mean Lower Upper 25th 50th 75th 95th Detection frequency Limit of Detection (LOD), wet-weight
PFOS PFOS ng/mL 110 7.00 6.12 8.00 4.66 7.10 10.4 25.8 100% 0.0621 ng/mL

### Project: Biomonitoring Exposures Study (BEST) - 2.Expanded

95% Confidence Interval Selected Percentiles
Chemical measured Indicates exposure to Units Number of people tested Geometric mean Lower Upper 25th 50th 75th 95th Detection frequency Limit of Detection (LOD), wet-weight
PFOS PFOS ng/mL 337 5.21 4.77 5.69 3.34 5.31 8.70 17.6 99.4% 0.0943 ng/mL

### Project: California Regional Exposure Study, Los Angeles County (CARE-LA)

95% Confidence Interval Selected Percentiles
Chemical measured Indicates exposure to Units Number of people tested Geometric mean Lower Upper 25th 50th 75th 95th Detection frequency Limit of Detection (LOD), wet-weight
PFOS PFOS ng/mL 425 2.13 1.92 2.35 1.27 2.43 3.98 8.33 97.9% 0.0615

### Project: California Teachers Study (CTS)

95% Confidence Interval Selected Percentiles
Chemical measured Indicates exposure to Units Number of people tested Geometric mean Lower Upper 25th 50th 75th 95th Detection frequency Limit of Detection (LOD), wet-weight
PFOS PFOS ng/mL 1759 6.80 6.56 7.04 4.57 7.14 10.9 19.5 99.8% 0.083

### Project: Firefighter Occupational Exposures (FOX) Project

95% Confidence Interval Selected Percentiles
Chemical measured Indicates exposure to Units Number of people tested Geometric mean Lower Upper 25th 50th 75th 95th Detection frequency Limit of Detection (LOD)
PFOS PFOS ng/mL 101 12.5 11.3 13.8 10.1 12.7 16.8 24.7 100% 0.083

### Project: Maternal and Infant Environmental Exposure Project (MIEEP)

95% Confidence Interval Selected Percentiles
Chemical measured Indicates exposure to Units Number of people tested Geometric mean Lower Upper 25th 50th 75th 90th Limit of Detection (LOD), wet-weight
PFOS PFOS ng/mL 77 2.55 2.20 2.95 1.78 2.43 4.11 4.90 0.083

### Project: Measuring Analytes in Maternal Archived Samples (MAMAS)

95% Confidence Interval Selected Percentiles
Chemical measured Indicates exposure to Units Number of people tested Geometric mean Lower Upper 25th 50th 75th 95th Detection frequency Limit of Detection (LOD), wet-weight
PFOS PFOS ng/mL 200 4.20 3.82 4.62 2.62 4.47 6.75 12.3 100% 0.057 ng/mL

### Footnotes

*Geometric mean was not calculated because the chemical was found in less than 65% of the study group.
*Geometric mean was not calculated because the chemical was found in less than 65% of the study group
**LOD changed during the time that samples were analyzed for this project.
# As of March 2013, PFBuS is no longer measured due to instrumental background interference.