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Table 1 Summary of the clinical phenotypes and CTG repeat lengths in myotonic dystrophy type 1

From: A patient with myotonic dystrophy diagnosed after experiencing sudden respiratory failure: a case report

Phenotype Clinical signs CTG repeat size Age of onset Average age of death
(years) (years)
Mild Cataracts 50 ~ 150 20 ~ 70 60 ~
Mild myotonia
Classical Muscle weakness 100 ~ 1,000 10 ~ 30 48 ~ 60
Myotonia
Cataracts
Cardiac arrhythmias
Congenital Infantile hypotonia > 1000 Birth to 10 45
Respiratory failure
Intellectual disability