Table 3.

Analysis of backward regression, which determines % of the variability of ITMWA, conditioned by the group of socio-demographic and clinical predictors in the group of patients with Parkinson’s disease.

Depended Variable	Model	Predictors	R2	F	p	ϐ	t	p
ITMWA	Complete model	Sex	R2 = 0.125; F(16,133) = 2.185; p < 0.01			0.007	0.083	0.934
		Age				0.041	0.452	0.652
		Professional education				0.141	0.944	0.347
		Medium education				0.092	0.551	0.582
		High education				0.206	1.266	0.208
		Levodopa treatment				0.138	1.493	0.138
		DA treatment				0.033	0.364	0.717
		MAOBI treatment				−0.047	−0.547	0.585
		Amantadine treatment				0.010	0.119	0.905
		Anticholinergic treatment				0.004	0.044	0.965
		Start of treatment with levodopa				0.157	1.483	0.141
		Start of treatment with DA				0.420	4.068	0.000
		LED				−0.087	−0.892	0.374
		Hoehn–Yahr scale				−0.210	−1.821	0.071
		UPDRS part III				0.352	1.181	0.240
		UPDRS part I + II + III				−0.242	−0.785	0.434
	Optimal model highest value R2	Higher Education	R2 = 0.171; F(6.133) = 5.585; p < 0.001			0.105	1.261	0.210
		Levodopa treatment				0.120	1.421	0.158
		Start of treatment with Levodopa				0.153	1.537	0.127
		Start of treatment with DA				0.440	4.595	0.000
		Hoehn–Yahr scale				−0.238	−2.283	0.024
		UPDRS part III				0.144	1.400	0.164

R²—amount of explained variance, F—value of Fisher’s statistics, p—statistical significance, ϐ—significance of the predictor in the model, t—result of Student’s t-test.