Table 2.

Correlations between the T1w/T2w ratio in the SNc and clinical measures.

	Study 1		Study 2
	p-value	β (95% CI)	p-value	β (95% CI)
Duration	0.41	0.53 (−0.02 – 1.79)	0.005	2.3 (0.70 – 3.87)
LEDD	0.86	−0.001 (−0.02 – 0.01)	0.89	0.001 (−0.02 – 0.02)
UPDRS III	0.07	0.36 (−0.03 – 0.75)	0.07	−0.51 (−1.08 – 0.05)
HDRS	0.85	−0.11 (−1.27 – 1.04)	0.87	0.16 (−1.73 – 2.05)
MoCA	0.0004	3.4 (1.58 – 5.14)	0.74	0.38 (−1.88 – 2.64)

Multiple regression analysis was used to test the correlation between clinical measures and T1w/T2w ratio values in the SNc. The clinical measures were independent variables, and the T1w/T2w was the dependent variable. Data are presented as p-values, β (95% CI).