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. Author manuscript; available in PMC: 2013 Nov 1.
Published in final edited form as: Mov Disord. 2012 Oct 8;27(13):1659–1665. doi: 10.1002/mds.25217

Table 4.

Multivariable adjusted* odds ratio (OR) (95% confidence interval) for Parkinson’s Disease by quintile (Q) of PCB concentration (ng/g serum).

Congener Q1 Q2 Q3 Q4 Q5 p-trend
PCB 118, range (ng/g serum) <0.234 0.234–0.287 0.288–0.360 0.361–0.460 0.460–1.387
Unconditional model# Ref 0.54 (0.26–1.12) 0.64 (0.30–1.36) 0.68 (0.31–1.46) 0.37 (0.14–0.95) 0.10
Conditional model$ Ref 0.73 (0.32–1.63) 0.76 (0.33–1.75) 0.65 (0.28–1.52) 0.38 (0.12–1.25) 0.13

PCB 138, range (ng/g serum) <0.488 0.489–0.631 0.632–0.820 0.829–1.157 1.157–3.630
Unconditional model# Ref 0.80 (0.38–1.66) 0.66 (0.30–1.45) 0.56 (0.23–1.35) 0.43 (0.16–1.14) 0.09
Conditional model$ Ref 0.86 (0.36–2.04) 0.64 (0.26–1.61) 0.61 (0.22–1.67) 0.41 (0.12–1.42) 0.16

PCB 153, range (ng/g serum) <0.768 0.769–1.016 1.020–1.346 1.347–1.882 1.884–5.211
Unconditional model# Ref 0.79 (0.38–1.65) 0.67 (0.31–1.49) 0.66 (0.28–1.56) 0.36 (0.13–1.00) 0.06
Conditional model$ Ref 0.72 (0.29–1.78) 0.66 (0.26–1.64) 0.65 (0.23–1.87) 0.28 (0.07–1.07) 0.08

PCB 180, range (ng/g serum) <0.436 0.436–0.620 0.620–0.813 0.813–1.133 1.137–3.071
Unconditional model# Ref 1.05 (0.50–2.23) 0.81 (0.34–1.89) 0.46 (0.18–1.22) 0.53 (0.19–1.53) 0.12
Conditional model$ Ref 1.53 (0.60–3.91) 1.24 (0.44–3.53) 0.58 (0.19–1.78) 0.65 (0.17–2.43) 0.17

Sum of Dioxin-like congeners, range (ng/g serum) <0.404 0.405–0.516 0.516–0.641 0.645–0.829 0.831–2.228
Unconditional model# Ref 0.68 (0.34–1.38) 0.63 (0.30–1.33) 0.65 (0.29–1.45) 0.34 (0.13–0.90) 0.05
Conditional model$ Ref 0.85 (0.39–1.83) 0.60 (0.27–1.36) 0.62 (0.25–1.52) 0.32 (0.10–1.05) 0.04

Total PCBs, range (ng/g serum) <4.56 4.56–5.79 5.81–7.46 7.49–10.00 10.01–82.10
Unconditional model# Ref 0.45 (0.22–0.94) 0.50 (0.23–1.08) 0.54 (0.24–1.21) 0.29 (0.12–0.70) 0.02
Conditional model$ Ref 0.43 (0.17–1.08) 0.53 (0.21–1.29) 0.53 (0.19–1.46) 0.28 (0.09–0.90) 0.08
*

Adjusting for matching factors age, sex, and region (by stratification in the conditional logistic model), as well as smoking, BMI, triglycerides, cholesterol, occupation, and serum dieldrin concentration.

Among 101 cases and 349 controls.

#

101 cases, 349 controls.

$

101 cases, 186 controls.