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"Less than 20% of hospitalised COVID-19 patients symptom free after a year"

should work; it's easy to infer that "after a year" refers to their hospitalisation anyway. If that is still too long: "Less than 20% hospitalised COVID patients symptom free after a year"

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Your dropped the "after recovery". Which I think is the central point of the article. That even when we consider people to have recovered, the majority still has symptoms.

What else would "after a year" mean though? People don't usually have COVID for that long.

Under 20% of in-patient COVID-19 infected symptom free a year after recovery

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