"Improvement of #LongCOVID symptoms over one year"
https://www.frontiersin.org/articles/10.3389/fmed.2022.1065620/full
Comment: I'm not sure this is that different to what happens in other infections e.g. EBV where the % satisfying ME/CFS criteria decreases over time in first couple of years
This suggests the DSQ questionnaire might be useful for long covid but I don't think it adds anything in terms of differences in recovery between long covid and CFS/ME:
"There was an expected difference for time since diagnosis, as the majority of PASC [long covid] patients had been diagnosed in the past year... 71 (51%) patients with ME/CFS had been sick for >4 years."
I imagine long-covid lasting a number of years would also be unlikely to improve significantly over a further 12 months.