Impact of COVID-19 positive status on outcome for individuals with stroke treated in acute inpatient rehabilitation.

This was an observational study with mostly unadjusted comparisons, so it shows associations rather than proof that COVID-positive status caused worse rehabilitation outcomes. It included only patients who survived and needed inpatient rehabilitation, so it says nothing about stroke patients who died, were not eligible for an inpatient rehabilitation facility, or were treated in less intensive settings. Not all stroke patients were tested for COVID-19, so some patients labelled COVID-negative may have been undiagnosed, asymptomatic, or minimally symptomatic. The study could not separate stroke type, such as ischemic versus hemorrhagic stroke, and it did not report detailed severity, respiratory status, or timing of infection. The sample was very large, so the authors used a threshold to decide which differences were important and did not adjust for testing many outcomes; some differences may not be clinically important. For functional abilities outcomes, patients with short or incomplete stays were excluded, which may bias those results.

Do not read these results as proof that COVID-positive status caused worse rehabilitation outcomes. The study was observational, did not adjust for most comparisons, and included only patients who survived and needed inpatient rehabilitation, so the differences may reflect illness severity, testing gaps, or selection.