Figure 1.

Association between age or gender and non-motor symptoms and quality of life. Points represent the regression coefficients of the linear models and bars the 95% confidence intervals. Outcome measures were standardized in order to make the estimates comparable. Models were adjusted for disease duration and study cohort. Positive β-coefficients for age or gender indicate worse quality of life or worse non-motor functioning for older people or women. Positive β-coefficients for interaction term (age*gender) indicate a worse quality of life or worse non-motor functioning with increasing age for women compared to men, whereas a negative interaction term indicates a worse quality of life or worse non-motor functioning with increasing age for men.