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Table 2 Median plasma PCB and OC pesticide concentrations (μg/L) (n = 669)

From: Exposure to polychlorinated biphenyls and organochlorine pesticides and risk of dementia, Alzheimer’s disease and cognitive decline in an older population: a prospective analysis from the Canadian Study of Health and Aging

OC concentrations Non-demented individuals (n = 513) Incident cases of dementia (n = 156) P-value
PCB congeners
 PCB 105 0.03 (0.01–0.04) 0.03 (0.02–0.04) 0.82
 PCB 118 0.14 (0.08–0.23) 0.14 (0.09–0.23) 0.85
 PCB 138 0.24 (0.17–0.36) 0.24 (0.16–0.35) 0.77
 PCB 153 0.43 (0.30–0.60) 0.44 (0.28–0.61) 0.98
 PCB 156 0.06 (0.04–0.08) 0.06 (0.04–0.08) 0.34
 PCB 163 0.08 (0.05–0.11) 0.08 (0.05–0.12) 0.43
 PCB 170 0.10 (0.07–0.14) 0.10 (0.07–0.15) 0.63
 PCB 180 0.34 (0.24–0.49) 0.35 (0.24–0.51) 0.82
 PCB 183 0.03 (0.02–0.05) 0.03 (0.02–0.05) 0.62
 PCB 187 0.10 (0.06–0.14) 0.09 (0.06–0.14) 0.52
OC pesticides
 β-HCH 0.12 (0.08–0.19) 0.13 (0.08–0.19) 0.88
 HCB 0.17 (0.10–0.27) 0.19 (0.10–0.30) 0.28
 Oxychlordane 0.11 (0.07–0.14) 0.11 (0.08–0.14) 0.87
cis-Nonachlor 0.02 (0.01–0.03) 0.02 (0.01–0.03) 0.37
trans-Nonachlor 0.15 (0.10–0.21) 0.14 (0.11–0.20) 0.77
p,p’-DDT 0.07 (0.02–0.13) 0.07 (0.02–0.13) 0.80
p,p’-DDE 4.10 (2.10–7.60) 4.10 (2.00–8.05) 0.82
  1. Note: β-HCH beta hexachlorocyclohexane, HCB hexaclorobenzene, OC organochlorine compound, PCBs polychlorinated biphenyl, p,p’-DDT, 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane, p,p’-DDE, 1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene
  2. Values in parentheses represent the interquartile range
  3. P-values were obtained using non-parametric Wilcoxon rank-sum tests