Table 4.

Overview of the used questionnaires

Score	Cronbach’s alpha	Validity (correlation coefficient r)
GAI [22]	0.91	0.57–0.70a
MDS-UPDRS [23]	0.79–0.93 across parts	0.76–0.96 across partsa
MoCA [24]	0.83	0.61a
PDQ-8 [25]	0.80	0.47–0.61b
PHQ-9 [26]	0.89	0.55b

^aConcurrent validity

^bConstruct validity