Table 1. Regression models of the relationship between age at onset (Age_o) and the progenitor allele length (ePAL) estimated from two different DNA tissue sources of the same DM1 patient.

Model	Source	Adjusted r2	p	Parameter		Coefficient	Standard error	t-statistic	p
Model 1: Ageo = β0 + β1 log(ePAL) n = 37 individuals	Blood	0.748	<0.001	Intercept	β0	121.07	9.28	13.05	<0.001
				log(ePAL)	β1	-39.83	3.84	-10.38	<0.001
	Saliva	0.661	<0.001	Intercept	β0	108.52	9.93	10.93	<0.001
				log(ePAL)	β1	-33.07	3.92	-8.44	<0.001
Model 2: Ageo = β0 + β1 log(ePAL) + β2 log(ePAL)2 n = 37 individuals	Blood	0.753	<0.001	Intercept	β0	217.28	74.63	2.91	0.006
				log(ePAL)	β1	-122.69	63.89	-1.92	0.063
				log(ePAL)2	β2	17.53	13.49	1.30	0.203
	Saliva	0.668	<0.001	Intercept	β0	208.38	76.32	2.73	0.010
				log(ePAL)	β1	-117.87	64.39	-1.83	0.076
				log(ePAL)2	β2	17.59	13.33	1.32	0.196

The table shows the squared coefficient of correlation (r²) and statistical significance (p) for each model, and the coefficient, standard error, t-statistic and statistical significance (p) associated with each parameter in the model. The number of individuals used in each analysis is indicated (n).