Many major outlets fail to mention when stories are based on preliminary research

News stories (%) that made some mention of whether the research cited was uncertain

Based on a scientific study sample of 521 stories that reported on Covid preprints between Jan 1 2020 and April 30 2020 in 15 news outlets

Chart: Press Gazette Source: Fleerackers, Riedlinger, Moorhead, Ahmad and Alperin (2021)