Table 1 Descriptive statistics of the study population

Age (y), median (IQR)

73 (69–79)

75 (70–78.8)

71 (69–79)

/

PDQ-39 summary index

26.8 (14.1–43.1)

18.5 (11.9–34.8)

45.3 (24.1–52.8)

0.464

MDS-UPDRS part III

26.5 (18–37)

24.5 (15–34.8)

34 (21.5–53.5)

0.282

NMS-Q

11 (6–15)

10 (6–15)

12.5 (7.3–15)

/

MMSE

27 (26–29)

28 (26–29)

27 (25–29)

/

BDI II

12 (6–17)

8 (5–13)

17.5 (13–22.5)

0.566

Sex (female), N (%)

37 (40.7)

23 (41.1)

14 (40.0)

/

GAS total score#

12 (6–19)

8 (4–11)

20 (19–25)

0.839

Somatic Subscale#

6 (3–8)

4 (2.3–5.8)

9 (8–11)

0.760

My heart raced or beat strongly

(item 1)

0 (0–1)

0 (0–0)

1 (0–1)

0.456

My breath was short

(item 2)

0 (0–1)

0 (0–1)

1 (0–1)

0.398

I had an upset stomach

(item 3)

0 (0–1)

0 (0–0)

0 (0–1)

0.224

I had difficulty falling asleep

(item 8)

1 (0–1)

1 (0–1)

1 (0–2)

0.369

I had difficulty staying asleep

(item 9)#

1 (1–2)

1 (0–2)

2 (1–3)

0.260

I had a hard time sitting still

(item 17)

0 (0–1)

0 (0–0)

1 (0–1)

0.488

I felt tired

(item 21)

1 (1–1)

1 (0–1)

2 (1–2)

0.574

My muscles were tense

(item 22)

1 (0–1)

1 (0–1)

1 (1–2)

0.448

I had back pain, neck pain, or muscle cramps

(item 23)

1 (1–2)

1 (0–2)

2 (1–3)

0.340

Cognitive Subscale

3 (1–5)

2 (0–3)

6 (5–9)

0.746

I felt like things were not real or like I was outside of myself

(item 4)

0 (0–0)

0 (0–0)

0 (0–0)

0.266

I felt like I was losing control

(item 5)

0 (0–1)

0 (0–0)

1 (0–1)

0.453

I had difficulty concentrating

(item 12)

1 (0–1)

1 (0–1)

1 (1–2)

0.473

I felt like I was in a daze

(item 16)

0 (0–1)

0 (0–0)

1 (0–1)

0.439

I worried too much

(item 18)

1 (0–1)

0 (0–1)

2 (1–2)

0.594

I could not control my worry

(item 19)

0 (0–1)

0 (0–0)

1 (0–2)

0.540

I felt like I had no control over my life

(item 24)

0 (0–1)

0 (0–0)

1 (0–1)

0.464

I felt like something terrible was going to happen to me

(item 25)

0 (0–0)

0 (0–0)

0 (0–1)

0.398

Affective Subscale

3 (1–5)

2 (0–3)

6 (4–9)

0.732

I was afraid of being judged by others

(item 6)

0 (0–1)

0 (0–0)

1 (0–1)

0.512

I was afraid of being humiliated or embarrassed

(item 7)

0 (0–0)

0 (0–0)

0 (0–1)

0.458

I was irritable

(item 10)

1 (0–1)

0 (0–1)

1 (1–1)

0.474

I had outbursts of anger

(item 11)

0 (0–0)

0 (0–0)

0 (0–1)

0.379

I was easily startled or upset

(item 13)

0 (0–1)

0 (0–0)

1 (1–1)

0.633

I was less interested in doing something I typically enjoy

(item 14)

1 (0–1)

0 (0–1)

1 (1–2)

0.388

I felt detached or isolated from others

(item 15)

0 (0–1)

0 (0–0)

1 (0–1)

0.547

I felt restless, keyed up, or on edge

(item 20)

1 (0–1)

0 (0–1)

1 (1–1)

0.558