Project Results for California Childhood Leukemia Study (CCLS)

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Results on page last updated: 07/31/2014

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 90th Detection frequency Limit of Detection (LOD), wet-weight
beta-Hexachlorocyclohexane (beta-HCH) b-HCH ng/g lipid 48 5.7 3.8 8.5 <LOD 5.9 10 29 69% 0.010 ng/mL
DDE (para,para) DDT (para,para) and/or DDE (para,para) ng/g lipid 48 190 160 230 120 180 290 420 100% 0.027 ng/mL
DDT (ortho,para) DDT (ortho,para) ng/g lipid 48 3.7 3.0 4.6 <LOD 5.3 7.1 8.2 69% 0.012 ng/mL
DDT (para,para) DDT (para,para) ng/g lipid 48 4.3 3.5 5.2 3.3 4.1 6.3 9.0 88% 0.010 ng/mL
Hexachlorobenzene (HCB) HCB ng/g lipid 48 7.7 7.2 8.1 6.8 7.8 8.5 10 100% 0.010 ng/mL
Oxychlordane Chlordane ng/g lipid 48 4.6 4.1 5.2 3.9 5.0 5.8 7.1 98% 0.010 ng/mL
trans-Nonachlor Chlordane ng/g lipid 48 8.8 7.7 10 6.7 8.8 11 15 100% 0.011 ng/mL

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 90th Detection frequency Limit of Detection (LOD), wet-weight
BDE 047 BDE 47 ng/g lipid 48 43 33 56 23 35 68 110 98% 0.074 ng/mL
BDE 099 BDE 99 ng/g lipid 48 11 8.5 14 6.5 10.1 12.7 25 100% 0.018 ng/mL
BDE 100 BDE 100 ng/g lipid 48 12 10 15 8.0 10 15 22 100% 0.015 ng/mL
BDE 153 BDE 153 ng/g lipid 48 10 7.6 14 5.0 8.9 16 46 96% 0.015 ng/mL
BDE 154 BDE 154 ng/g lipid 48 * * * <LOD <LOD 3.6 5.7 48% 0.015 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 90th Detection frequency Limit of Detection (LOD), wet-weight
PCB 028 PCB 28 ng/g lipid 48 4.1 3.6 4.7 <LOD 3.6 4.3 6.8 100% 0.010 ng/mL
PCB 066 PCB 66 ng/g lipid 48 2.2 1.9 2.4 1.7 2.3 2.9 3.4 85% 0.010 ng/mL
PCB 074 PCB 74 ng/g lipid 48 3.0 2.7 3.3 2.4 3.2 3.8 4.2 98% 0.010 ng/mL
PCB 099 PCB 99 ng/g lipid 48 2.7 2.5 3.1 2.2 3.0 3.5 4.3 90% 0.010 ng/mL
PCB 101 PCB 101 ng/g lipid 48 1.7 1.5 1.9 <LOD 1.8 2.3 2.9 65% 0.010 ng/mL
PCB 105 PCB 105 ng/g lipid 48 1.9 1.7 2.1 <LOD 2.0 2.5 2.7 73% 0.010 ng/mL
PCB 118 PCB 118 ng/g lipid 48 4.0 3.7 4.5 3.2 4.0 5.4 6.7 100% 0.010 ng/mL
PCB 138 PCB 138 ng/g lipid 48 6.8 5.9 7.9 4.8 6.4 9.4 14 100% 0.010 ng/mL
PCB 153 PCB 153 ng/g lipid 48 11 8.9 13 6.5 9.7 17 28 100% 0.010 ng/mL
PCB 156 PCB 156 ng/g lipid 48 2.6 2.3 2.9 1.9 2.5 3.4 4.1 94% 0.010 ng/mL
PCB 167 PCB 167 ng/g lipid 48 * * * <LOD 1.6 2.1 2.3 60% 0.010 ng/mL
PCB 170 PCB 170 ng/g lipid 48 4.6 4.0 5.3 3.2 4.4 6.6 9.9 100% 0.010 ng/mL
PCB 180 PCB 180 ng/g lipid 48 10 8.4 12 6.1 9.3 15 25 100% 0.010 ng/mL
PCB 183 PCB 183 ng/g lipid 48 2.2 2.0 2.5 1.6 2.4 2.8 3.3 81% 0.011 ng/mL
PCB 187 PCB 187 ng/g lipid 48 3.5 3.1 4.1 2.5 3.4 4.6 7.2 100% 0.010 ng/mL
PCB 194 PCB 194 ng/g lipid 48 3.1 2.8 3.5 2.3 3.2 4.2 5.4 100% 0.010 ng/mL
PCB 203 PCB 203 ng/g lipid 48 3.0 2.7 3.3 2.2 3.1 4.0 5.3 100% 0.010 ng/mL

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