When comparing individuals with self-limiting and persistent myopathy, there was no difference in age (median 67.2 vs 65.5 years, P = 0.6), peak CK (median 5734 vs 7064 IU/l, P = 0.7), anti-HMGCR titre (UK: insufficient data; Australia: median 24.9 vs 31.5 RU, z = 0.6, P = 0.5) or comorbid type 2 diabetes (4/5 vs 52/101, P = 0.4). Here, HMGCR is linked to type 2 diabetes mellitus.