Similarly, the median serum titin/Cr ratios in the DMD, clinically DMD, BMD, and clinically BMD were 4,442 (623–58,070), 7,607 (4,901–8,610), 237 (26–3,531), and 2,525 (1,965–12,218) pmol/mg Cr, respectively, and were significantly higher in the DMD than in the BMD (p < 0.001) (Figure 2D) (d = 0.86, 95% CI 0.69–1.30). Here, TTN is linked to Duchenne muscular dystrophy.