Actual paper ...

> Among participants who tested positive for COVID-19, 68.7% experienced at least one symptom after 30 days, marking the distinction for long COVID. This prevalence increased to 77% after 60 days of follow-up. Researchers also found that individuals who experienced long COVID were more likely to be less educated, have seasonal allergies and pre-existing health conditions, and self-report greater symptom severity than people without long COVID.

https://journals.plos.org/plosone/article?id=10.1371/journal...