CNTN3 and Parkinson disease: Multivariable logistic regression models, adjusted for age and sex, revealed that PD occurrence was associated with higher plasma levels of PAA (OR 4.00, 95% CI 2.52–6.53, P < 0.001), PAGln (OR 3.73, 95% CI 2.43–5.84, P < 0.001), PLA (OR 3.03, 95% CI 1.25–7.50, P = 0.015), PPA (OR 1.75, 95% CI 1.36–2.27, P < 0.001), Pcs (OR 2.29, 95% CI 1.74–3.07, P < 0.001), Pcg (OR 2.07, 95% CI 1.65–2.61, P < 0.001), and IS (OR 3.02, 95% CI 1.79–5.24, P < 0.001) (Supplementary Table 2).