Genetics partially predicts prognosis. Those with large D4Z4 repeat deletions (with a remaining D4Z4 repeat array size of 10-20 kbp, or 1-4 repeats) are more likely to have severe and early disease, as well as non-muscular symptoms. Those who have the genetic mutations of both<unk> 1 and<unk> 2 are more likely to have severe disease. It has also been observed that disease manifestation is milder when a prominent family history is present, as opposed to a new mutation. In some large families, 30% of those with the mutation do not show symptoms, and 30% of those with symptoms do not progress beyond facial and shoulder weakness. Women are less likely to be symptomatic, and if symptomatic have less severe manifestations. Remaining variations in disease course are attributed to unknown environmental factors. A single study found that disease course is not worsened by tobacco smoking or alcohol consumption, common risk factors for other diseases. Pregnancy Pregnancy outcomes are overall good in mothers with<unk> ; there is no difference in rate of preterm labor, rate of miscarriage, and infant outcomes. However, weakness can increase the need for assisted delivery. A single review found that weakness worsens, without recovery, in 12% of mothers with<unk>  during pregnancy, although this might be due to weight gain or deconditioning.
Facioscapulohumeral muscular dystrophy
Limb–girdle muscular dystrophy
Becker muscular dystrophy
Ullrich congenital muscular dystrophy
Fukuyama congenital muscular dystrophy
Spinal muscular atrophy
Duchenne muscular dystrophy
Jokela type spinal muscular atrophy