TTN and Becker muscular dystrophy: In contrast, the median (range) serum titin values in the DMD, clinically DMD, BMD, and clinically BMD were 5,246 (374–104,525), 6,815 (5,111–9,373), 1,021(151–11,653), and 6,064 (1,768–23,214) pmol/L, respectively, with the DMD showing a significantly higher serum titin level than the BMD (p < 0.001) (Figure 2B) (d = 0.54, 95% CI 0.39–0.90).