Table 3 Results of forward stepwise linear regression analysis for predictors of change in cognition and motor function in PD subjects.

Outcome measure	Explanatory variable	Univariate models			Final multivariate models
		b	95%CI	p	b	95%CI	p
Change in MMSE score	Presence of a PIGD subtype	−2.64	−4.45 to −0.84	0.005	−2.29	−4.13 to −0.46	0.016
	Baseline total CAMCOG score	0.15	0.00 to 0.30	0.044
	Baseline total GDS score	0.18	−0.18 to 0.54	0.316
Change in total CAMCOG score	Presence of a PIGD subtype	−7.29	−12.20 to −2.37	0.005	−7.29	−12.20 to −2.37	0.005
	Baseline total CAMCOG score	0.14	−0.28 to 0.56	0.490
	Baseline total GDS score	0.36	−0.63 to 1.35	0.462
Change in total UPDRS III score	Presence of a PIGD subtype	−6.45	−15.73 to 2.82	0.166
	Baseline total CAMCOG score	0.60	−0.09 to 1.29	0.088
	Baseline total GDS score	−0.88	−2.57 to 0.80	0.294