Table 2.

Multivariate logistic regression analysis for the independent association between baseline plasma GFAP and motor subtype conversions

Motor subtypes	Univariatea		Multivariateb
	OR (95% CI)	P value	OR (95% CI)	P value
GFAP
TD group	1.251 (1.025–1.525)	0.027	1.283 (1.020–1.614)	0.033
PIGD group	0.614 (0.412–0.917)	0.017	0.551 (0.332–0.915)	0.021

CI confidence interval, OR odds ratio, GFAP Glial fibrillary acidic protein, PIGD postural instability and gait disturbance, TD tremor-dominant, PIGD postural instability and gait disturbance, UPDRS Unified Parkinson’s Disease Rating Scale.

^aResults from univariable logistic regression.

^bResults from multivariable logistic regression: TD group adjusted for age and UPDRS-III; PIGD group adjusted for age, H-Y, and UPDRS-III.