Table 2. Hand Tremor Questionnaire: results for each question in differentiating between PD (n=24) and ET (n=25).

Question	PD	ET	p
1 Does your hand tremor worsen when you relax your arms?	15 (62.5)	4 (16)	0.001*
2 Does your hand tremor worsen while focusing on something? (e.g., watching TV or talking)	6 (25)	7 (28)	0.812†
3 Does your hand tremor worsen (e.g., you can't feel it or realize it is there) when someone looks at you?	13 (54.2)	15 (60)	0.680†
4 Does your tremor in one hand worsen more than in the other hand, or does only one hand show tremor?	24 (100)	12 (48)	<0.001*
5 Did your hand tremor start to develop on one side only?	24 (100)	11 (44)	<0.001*
6 Did your tremor in both hands start to develop at similar times?	0 (0)	13 (52)	<0.001*
7 Currently, are both of your hands shaking similarly?	0 (0)	13 (52)	<0.001*
8 Does your hand tremor worsen when holding something or stretching your arm?	6 (25)	15 (60)	0.013†
9 Does your hand tremor worsen when using chopsticks or a spoon?	6 (25)	18 (72)	0.001†
10 Does your hand tremor worsen when you write letters?	4 (16.7)	18 (72)	<0.001*
11 Does your hand tremor worsen when holding something? (e.g., a cup or cellular phone)	9 (37.5)	21 (84)	0.001*
12 Does your hand tremor reduce when drinking alcohol, or worsen when sobering up after drinking alcohol?	4 (16.7)	9 (36)	0.196*

Data are n (%) values for ‘yes’ responses. p values were assessed using.

^*Fisher's exact test or the ^†Chi-square test.

ET: essential tremor, PD: Parkinson's disease.