Table 2. Primary Outcomes.

Diagnosis	Participants, No.		Proportion of participants positive for P-SYN, % (95% CI)
	P-SYN positivea	P-SYN negativeb
Synucleinopathy	213	10	95.5 (91.9-97.8)
Parkinson disease	89	7	92.7 (85.6-97.0)
Multiple system atrophy	54	1	98.2 (91.7-99.9)
Dementia with Lewy bodies	48	2	96.0 (86.3-99.5)
Pure autonomic failure	22	0	100 (84.6-100)
No synucleinopathy	4	116	3.3 (1.3-8.0)

Abbreviation: P-SYN, phosphorylated α-synuclein.

^a Positive for P-SYN in at least 1 biopsy site.

^b Negative for P-SYN in all biopsy sites.