One of the paper’s authors said on average "15-25% of patients who tested positive for COVID-19 in hospital had contracted the virus after being admitted. “The data also showed mortality was 6 percentage points higher for people who caught COVID-19 in hospital, compared to controls who did not.”"

Simple measures lessen hospital-acquired COVID-19 infections

Thanks for this. Going to a hospital for a sleep study this week and will bring with me.