GSTM1 and inclusion body myositis: However, no significant difference in the calculated log‐αSN/Hb ratio was observed between IBM (1.33 ± 0.54) and CTR (1.21 ± 0.22) nor between the other groups (IIM: 1.36 [± 0.31]; HER: 1.41 [± 0.45]) (p = 0.79, Kruskal–Wallis test, Figure S5d).