DMD and neuromuscular disease caused by qualitative or quantitative defects of dystrophin: Among all 931 foetuses (twins in one pregnancy were counted twice), 20.73% (193/931) were males expected to develop dystrophinopathies, 16.33% (152/931) were female carriers, 37.59% (350/931) were males without DMD mutations and 25.35% (236/931) were females without DMD mutations.