AstraZeneca released additional information regarding their latest COVID-19 vaccine trial after government officials expressed concern that they were using outdated information.

The newly released data, unveiled on Thursday, show a vaccine efficacy lower than the data previously released. After they released the data on Monday, which showed a 79% efficacy in preventing symptomatic cases, the National Institutes of Health’s committee of clinical trial analysts “expressed concern that AstraZeneca may have included outdated information from that trial.”