US population mortality rates compared dermatomyositis (DM) vs polymyositis (PM) in 1981 (12,249) & 2020 (23,608). Downward trend in DM/PM mortality (<7%); plus PM/DM was 2X more likely to be one of mult causes, instead of, sole cause of death. https://t.co/9KZKr8JxUE https://t.co/7acK0eHVku