Table 1.

Baseline characteristics of the study population at the time of inclusion.

	PHT group	DBS group	POP group
Number of patients (male/female)	20 (9/11)	20 (12/8)	14 (8/6)
Age	59.1 ± 11.7	55.2 ± 8.6	51.4 ± 8.7
Duration of the symptoms [years]	10.4 ± 4.9	11.3 ± 3.9	13.2 ± 3.5
UPDRS “on” / “off”	25.4 ± 9.7/50.9 ± 16.1	28.3 ± 11.6/59.7 ± 14.7	20.4 ± 11.6/61.2 ± 17.2*
UPDRS part III “on” / “off”	12.8 ± 4.8/32.3 ± 10.5	11.5 ± 5.5/34.1 ± 7.9	10.2 ± 6.5/39.5 ± 12.4*

The groups do not vary significantly (P > 0.05).

^*In the POP group “on” – on medication + on stimulation and “off” – off medication + off stimulation.