Project Results for California Teachers Study (CTS)

You may use, distribute or copy the information in these data tables, with attribution to Biomonitoring California. For more information, visit our researchers page or contact us.
Results on page last updated: 09/22/2015

Chemical Group: Organochlorine Pesticides

  • Measured in: Serum
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
beta-Hexachlorocyclohexane (beta-HCH) b-HCH ng/g lipid 793 5.21 4.88 5.57 2.79 5.24 9.66 25.3 84.5% 0.015 ng/mL
DDE (para,para) DDT (para,para) and/or DDE (para,para) ng/g lipid 793 301 283 320 159 298 540 1360 100% 0.015 ng/mL
DDT (ortho,para) DDT (ortho,para) ng/g lipid 793 * * * <LOD <LOD <LOD <LOD 2.3% 0.031 ng/mL
DDT (para,para) DDT (para,para) ng/g lipid 793 1.94 1.87 2.02 <LOD 1.84 2.58 5.47 67.7% 0.015 ng/mL
Hexachlorobenzene (HCB) HCB ng/g lipid 793 12.0 11.7 12.2 9.75 11.9 14.3 20.8 100% 0.015 ng/mL
Oxychlordane Oxychlordane ng/g lipid 793 8.34 7.95 8.75 5.52 8.63 13.0 23.6 98.1% 0.015 ng/mL
trans-Nonachlor t-Nonachlor ng/g lipid 793 15.3 14.6 16.0 10.1 14.8 23.4 49.4 99.9% 0.015 ng/mL

Chemical Group: Perfluorochemicals (PFCs)

  • Measured in: Serum
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
Et-PFOSA-AcOH EtPFOSAAcOH ng/mL 1759 0.031 0.029 0.032 0.015 0.030 0.060 0.20 84.5% 0.011
Me-PFOSA-AcOH MePFOSAAcOH ng/mL 1759 0.20 0.19 0.21 0.10 0.20 0.41 1.3 98.4% 0.013
PFBuS PFBuS ng/mL 614 *,# * * <LOD <LOD <LOD 0.067 18.4% 0.022
PFDeA PFDeA ng/mL 1759 0.22 0.21 0.23 0.15 0.23 0.35 0.67 94.7% 0.032
PFDoA PFDoA ng/mL 1737 * * * <LOD <LOD <LOD 0.093 10.8% 0.036
PFHpA PFHpA ng/mL 1759 0.054 0.052 0.057 <LOD 0.054 0.11 0.28 74% 0.015
PFHxS PFHxS ng/mL 1759 1.62 1.56 1.68 1.04 1.58 2.50 6.24 99.9% 0.012
PFNA PFNA ng/mL 1719 0.92 0.89 0.95 0.67 0.95 1.3 2.3 99.7% 0.014
PFOA PFOA ng/mL 1759 2.46 2.39 2.53 1.69 2.50 3.63 6.22 99.9% 0.029
PFOS PFOS ng/mL 1759 6.80 6.56 7.04 4.57 7.14 10.9 19.5 99.8% 0.083
PFOSA PFOSA ng/mL 1597 0.036 0.034 0.039 <LOD 0.036 0.075 0.25 74.1% 0.01
PFUA PFUA ng/mL 1759 0.13 0.12 0.13 0.081 0.14 0.23 0.42 96.8% 0.01

Chemical Group: Polybrominated Diphenyl Ethers (PBDEs)

  • Measured in: Serum
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
BDE 017 BDE 17 ng/g lipid 1980 * * * <LOD <LOD <LOD <LOD 0.2% 0.006 ng/mL
BDE 028 BDE 28 ng/g lipid 1980 * * * <LOD <LOD 1.96 4.73 42.9% 0.008 ng/mL
BDE 047 BDE 47 ng/g lipid 1980 14.1 13.6 14.7 7.22 13.1 25.3 73.5 86.4% 0.024 ng/mL
BDE 066 BDE 66 ng/g lipid 1980 * * * <LOD <LOD <LOD <LOD 0.05% 0.007 ng/mL
BDE 085 BDE 85 ng/g lipid 1980 * * * <LOD <LOD <LOD 1.87 7.8% 0.002 ng/mL
BDE 099 BDE 99 ng/g lipid 1980 * * * <LOD <LOD 5.00 16.0 44.3% 0.018 ng/mL
BDE 100 BDE 100 ng/g lipid 1980 2.62 2.50 2.73 1.19 2.31 4.71 15.7 75.9% 0.004 ng/mL
BDE 153 BDE 153 ng/g lipid 1980 5.60 5.34 5.85 2.66 4.75 9.48 43.1 77% 0.009 ng/mL
BDE 154 BDE 154 ng/g lipid 1980 * * * <LOD <LOD <LOD <LOD 3.9% 0.007 ng/mL
BDE 183 BDE 183 ng/g lipid 1980 * * * <LOD <LOD <LOD <LOD 1.7% 0.007 ng/mL
BDE 197 BDE 197 ng/g lipid 1980 * * * <LOD <LOD <LOD 3.58 8.4% 0.005 ng/mL
BDE 201 BDE 201 ng/g lipid 1980 * * * <LOD <LOD <LOD <LOD 2.5% 0.005 ng/mL
BDE 202 BDE 202 ng/g lipid 1980 * * * <LOD <LOD <LOD <LOD 2.9% 0.005 ng/mL
BDE 203 BDE 203 ng/g lipid 1980 * * * <LOD <LOD <LOD <LOD 2.1% 0.005 ng/mL
BDE 206 BDE 206 ng/g lipid 1862 * * * <LOD <LOD <LOD <LOD 3.3% 0.004 ng/mL
BDE 207 BDE 207 ng/g lipid 1857 * * * <LOD <LOD <LOD 4.56 9.3% 0.006 ng/mL
BDE 208 BDE 208 ng/g lipid 1814 * * * <LOD <LOD <LOD <LOD 3.7% 0.003 ng/mL
BDE 209 BDE 209 ng/g lipid 1797 * * * <LOD <LOD <LOD 33.3 8.7% 0.053 ng/mL

Chemical Group: Polychlorinated Biphenyls (PCBs)

  • Measured in: Serum
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
PCB 066 PCB 66 ng/g lipid 793 * * * <LOD <LOD 1.68 3.07 39.8% 0.015 ng/mL
PCB 074 PCB 74 ng/g lipid 793 5.96 5.67 6.26 3.84 6.43 9.53 17.7 96.5% 0.015 ng/mL
PCB 099 PCB 99 ng/g lipid 793 3.11 2.97 3.27 2.01 3.07 4.82 9.73 90.4% 0.015 ng/mL
PCB 101 PCB 101 ng/g lipid 793 * * * <LOD <LOD <LOD <LOD 3.3% 0.015 ng/mL
PCB 105 PCB 105 ng/g lipid 793 * * * <LOD 1.46 2.02 4.39 53% 0.015 ng/mL
PCB 118 PCB 118 ng/g lipid 793 6.50 6.18 6.83 4.09 6.41 10.4 22.0 99% 0.015 ng/mL
PCB 138 PCB 138 ng/g lipid 793 12.9 12.3 13.5 8.39 13.5 20.5 37.1 99.5% 0.015 ng/mL
PCB 153 PCB 153 ng/g lipid 793 28.7 27.5 30.0 19.5 30.1 43.6 72.9 100% 0.015 ng/mL
PCB 156 PCB 156 ng/g lipid 793 4.92 4.72 5.12 3.55 5.22 7.23 11.8 96.7% 0.015 ng/mL
PCB 170 PCB 170 ng/g lipid 793 9.18 8.82 9.55 6.68 9.68 13.5 20.7 99.4% 0.015 ng/mL
PCB 180 PCB 180 ng/g lipid 793 31.5 30.3 32.9 22.4 33.3 48.4 76.8 100% 0.015 ng/mL
PCB 183 PCB 183 ng/g lipid 793 2.37 2.27 2.47 1.65 2.4 3.5 5.98 82% 0.015 ng/mL
PCB 187 PCB 187 ng/g lipid 793 7.25 6.92 7.59 4.83 7.65 11.04 20.2 98.4% 0.015 ng/mL
PCB 194 PCB 194 ng/g lipid 793 7.52 7.23 7.83 5.37 7.83 11.09 17.88 99.6% 0.015 ng/mL
PCB 203 PCB 203 ng/g lipid 793 6.47 6.17 6.78 4.36 6.75 10.14 16.71 97.2% 0.015 ng/mL

Footnotes

*Geometric mean was not calculated because the chemical was found in less than 65% of the study group
# As of March 2013, PFBuS is no longer measured due to instrumental background interference.