The Parkinson’s Disease Progression Neuroimaging Initiative

Table 4

Sample distribution of research cohorts and healthy subjects.

Cohort	Number	Subjects were followed up	Cases of follow-up	Cases of only one follow-up	Cases of over twice follow-up
PSP	19	19	23	15	4
MSA	23	23	31	16	7
PD	83	71	134	32	39
RBD	51	36	107	5	31
HC	48	23	43	9	14