Table 4.

Results of the 33 variable random survival forests analysis. Predictors are ranked by minimal depth (MD)

Rank	Predictor	MD	Vimp	Rank	Predictor	MD	Vimp
1	Disease duration	2.2175	0.0508	17	Age	5.7695	0.0006
2	SE‐ADL	3.4480	0.0129	18	Serum urate	5.8085	0.0009
3	MDS‐UPDRS.total	3.7695	0.0078	19	Age.at.Diagnosis	5.8190	−0.0001
4	Contralateral putamen*	5.1750	0.0027	20	CSF P.tau/.A‐beta	5.8505	0.0010
5	CSF P.tau	5.2765	0.0018	21	CSF t‐tau/A‐beta	5.8530	0.0003
6	Ipsilatearal .putamen*	5.3680	0.0016	22	SCOPA.total	5.9180	0.0014
7	MOCA.total	5.4015	0.0036	23	CSF t.tau	5.9440	0.0008
8	CSF P‐tau/t‐tau	5.6150	0.0021	24	RBD Q	5.9500	0.0013
9	Education	5.6220	0.0021	25	GDS.total	6.0290	0.0013
10	STAI.state	5.6290	0.0021	26	Epworth.SS	6.0515	0.0009
11	STAI.trait	5.6530	0.0018	27	Side Most Affected	7.2495	−0.0002
12	CSF A‐beta 1–42	5.6825	0.0004	28	Gender	7.8210	0.0003
13	Contralateral caudate*	5.6990	0.0013	29	Hoehn and Yahr.	7.8570	−0.0005
14	Ipsilatearal.caudate*	5.7080	0.0013	30	TD/ non‐TD	7.9525	0.0005
15	PIGD sum score	5.7325	0.0031	31	QUIP	8.3090	0.0014
16	CSF Alpha.Synuclein	5.7645	0.0002	32	Family history	8.4520	−0.0007
				33	Ethnicity	9.6355	−0.0000

Note: *Ipsilateral and contralateral refer to DAT tracer uptake and are defined in relation to the predominant side of clinical symptoms. For PD subjects with symmetrical presentation, ipsilateral and contralateral sides are defined as the mean of the left and right values.

Please, refer to Table 1 for the explanation of the abbreviations.