Table 2

FTM tremor rating scale, clinical scores in the on and off states

FTM scale, item	Maximal possible score	Non-blinded DBS ‘off’	Non-blinded DBS ‘on’	Blinded DBS ‘off’	Blinded DBS ‘on’	p Value*	p Value†
Sum ETRS (1–14)	116	58.62	34.08	56.07	35.23	<0.001	<0.001
Tremor scores (1–9)	80	29.62	12.85	28.2	14.85	0.001	0.002
Voice tremor	4	1.38	0.77	2.08	2.15	0.001	0.673
Head tremor‡	8	1.23	0.38	1.38	0.69	0.011	0.013
Tremor upper extremity§
Ipsilateral	12	7.5	5.33	6.33	5.5	0.077	0.197
Contralateral	12	8.7	3.55	8.7	4.0	<0.001	<0.001
RUE (item 5)
Rest	4	2.15	0.08	2.15	0.23	<0.001	0.001
Postural	4	2.77	0.92	2.85	1.15	<0.001	0.002
Action	4	2.77	1.54	2.77	1.62	0.001	0.002
Handwriting (item 10)	4	2.69	1.46	2.23	1.31	0.002	0.002
Hand function (items 11–14)
Ipsilateral	16	11.67	11.0	10.67	9.83	0.102	0.102
Contralateral	16	13.55	9.55	13.75	9.45	<0.001	0.001

*Comparison between non-blinded DBS on/off.
†Comparison between blinded on/off DBS.
‡Includes rest and postural tremor.
§Includes, rest postural and action tremor. Contralateral hemibodies n=20, ipsilateral hemibodies n=6.
DBS, deep brain stimulation; ETRS, Essential Tremor Rating Scale; FTM, Fahn–Tolosa–Marin; RUE, right upper extremity.