Table 1

Parameter estimates obtained from the parametric survival model

	Parameter estimate	Parameter standard error	p Value
SCA1
Intercept	5.4952	0.1924	<0.0001
Expanded allele	−0.0487	0.0019	<0.0001
Shorter allele	0.0133	0.0055	0.0151
Standard deviation (γ_G)	0.1748	0.0069
SCA2
Intercept	7.6301	0.1802	<0.0001
Expanded allele	−0.1051	0.0046	<0.0001
Standard deviation (γ_G)	0.2520	0.0101
SCA3
Intercept	7.4908	0.1853	<0.0001
Expanded allele	−0.0564	0.0027	<0.0001
Standard deviation (γ_G)	0.2167	0.0076
SCA6
Intercept	6.3470	0.2684	<0.0001
Expanded allele	−0.0901	0.0091	<0.0001
Shorter allele	−0.0285	0.0102	0.0053
Standard deviation (γ_G)	0.1738	0.0095

SCA, spinocerebellar ataxias.