Table 4.

Regression analyzing the relationship between the groups and the demographical and clinical factors, controlled for age, sex and education

Dependent variables		Independent variables
		Age	Sex	Education	Prodromal PD
MDS-UPDRS I	Estimate	0.042	1.457	–0.019	3.491
	p	p = 0.159	p = 0.018*	p = 0.811	p < 0.001**
MDS-UPDRS II	Estimate	0.021	–0.087	–0.082	1.462
	p	p = 0.199	p = 0.781	p = 0.043*	p < 0.001**
MDS-UPDRS III	Estimate	0.118	–0.736	–0.138	0.807
	p	p < 0.001**	p = 0.222	p = 0.074	p = 0.227
BDI	Estimate	0.018	2.050	–0.066	2.931
	p	p = 0.601	p = 0.004*	p = 0.462	p < 0.001**
SAS	Estimate	0.032	–0.017	–0.316	2.957
	p	p = 0.307	p = 0.979	p < 0.001**	p < 0.001**
PDQ-39	Estimate	–0.020	1.085	–0.260	6.043
	p	p = 0.718	p = 0.318	p = 0.059	p < 0.001**

^*Significant at the unadjusted 5% level (p≤0.05) (two-tailed); ^**Significant at the Bonferroni-adjusted 5% level (p≤0.05/23) (two-tailed).