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Table 1 Age-dependent risk for asymptomatic individuals with an MJD a priori risk of 50% (data from Bettencourt et al. [33]).

From: Machado-Joseph Disease: from first descriptions to new perspectives

Age in years Probability of detectable gene expression Probability of heterozygous if unaffected
10 0.02 0.50
20 0.03 0.49
30 0.22 0.44
40 0.53 0.32
50 0.80 0.17
60 0.96 0.04
70 1.00 ~0