Table 3:

Region-of-interest measurements^*

	Controls		a-ET		h-ET		Raw Values		ANCOVA Age-Sex-TIV
	Mean	SD	Mean	SD	Mean	SD	t	P	t	P
TIV	1428.5	130.4	1438.9	134	1438.8	105.8	.05	.95	–	–
CV	895.9	86.4	892.1	111.7	867.6	72.6	.57	.56	1.9	.17
CrV	110.5	15.5	102.76	21.1	98.2	13.6	3.02	.056	4.75	.012
Midsagittal vermal area	898.6	170.6	849.8	124.6	790.3	94.5	3.32	.042	3.28	.044
Anterior lobule area	394.5	74.6	373.7	53.9	343.8	37.9	3.91	.025	3.46	.038
Posterior sup. lobule area	209.7	47.3	201.1	37.4	195.8	37.1	.62	.54	.66	.51
Posterior inf. lobule area	294.3	69.5	274.9	56.6	250.6	43.1	2.9	.057	3.21	.047

Note:—sup. indicates superior; inf., inferior; a-ET, arm tremor; h-ET, arm and head tremor; TIV, total intracranial volume; CV, cerebellar volume; CrV, cerebral volume; -, perform ANCOVA analysis by using 3 nuisance variables (age + sex + TIV).

^*Volumes are in cubic millimeters; areas are in square millimeters.