a weakly significant differenceP = 0.0451
No decrease with age was found when participants were divided in four different age groups (18–30, 31–40, 41–50, and > 50 years old), with just one exception in the PD1 survey where a weakly significant difference was found between the 18–30 and the 41–50 years old groups ( P = 0.0451, Supplementary Fig.