Table 1 Participant characteristics.

Demographics

 Sex (% male)

35

62.9

 Age (years)

35

69.1 (7.8)

 Education (years)

35

16.7 (2.1)

 Race (% white)

35

100

 PD duration (years)

35

10.5 (5.3)

Clinical assessments

 Total LEDD^a (mg/day)

35

906.5 (570.8)

 UPDRS^b III

35

23.3 (11.7)

 Geriatric depression scale—15 Item

35

2.6 (2.3)

 Hoehn and Yahr stage

35

2.4 (0.7)

Cognitive assessments (in-person results)

 DRS-2^c

35

136.1 (5.9)

 MoCA^d

35

26.7 (2.6)

 Clock draw test

35

5.2 (1.1)

 Boston naming test

35

57.5 (3.2)

 Judgment of line orientation

35

23.3 (4.3)

 Trails A

35

42.6 (17.0)

 Trails B

35

99.5 (57.8)

 Symbol digit modalities test

35

33.9 (12.0)

 HVLT-R^e total immediate

35

22.2 (5.4)

 HVLT-R delayed

35

6.7 (3.7)

 HVLT-R recognition discrimination

35

9.4 (2.3)

 Letter-number sequencing

35

9.5 (2.1)

 Verbal fluency—FAS

35

45.7 (13.0)

 Verbal fluency—animals

35

18.7 (5.8)

 Cognitive diagnosis (%)

35

Normal cognition

Cognitive impairment

65.7

34.3

Functional assessments

 Penn daily activities questionnaire—15

35

45.9 (10.7)

 Activities of daily living inventory

33

70.6 (10.2)