Age-adjusted hazard ratios and 95% CI by occupational complexity (continuous) for risk of PD, sex and smoking included as covariates.

Note. N (all) = 28,778; N (men) = 15,465; N (women) = 13,313; Model 1. Cox proportional hazard regression analysis adjusting for age in the time scale with robust standard errors to adjust for correlation within twin pairs, and with sex and smoking as covariates. Model 2. Cox proportional hazards regression analysis stratified by twin pair adjusting for age in the time scale and including sex and smoking as covariates.*pAge-adjusted hazard ratios and 95% CI by occupational complexity (continuous) for risk of PD, sex and smoking included as covariates.