Table 1:

Patient demographics

		Number of patients	Age of onse
			(mean ± st. dev.)	p-value
Gender	Male	36 (20.2%)	40.3±12.3	0.80
	Female	142 (79.8%)	39.3±14.2
Age		178	39.5±13.8	n/a
Phenotype	ABSD	77 (43.3%)	38.5±12.3	0.36
	ADSD	101 (56.7%)	40.2±14.9
	With voice tremor	53 (29.8%)	43.3±13.1	0.013
	Without voice tremor	125 (70.2%)	37.85±13.8
	Early Onset	69 (38.8%)	25.1±7.2	<0.0001
	Late Onset	109 (61.2%)	48.6±8.0
Genotype	Familial	45 (25.3%)	39.4±14.7	0.97
	Sporadic	133 (74.7%)	39.5±13.5
Total SD		178	39.5±13.8	n/a

st. dev. – standard deviation; n/a – not applicable