Fig. 3From: Virtual inverted classroom to replace in-person radiology lectures at the time of the COVID-19 pandemic - a prospective evaluation and historic comparisonStudents’ radiology examination grades from 1 (excellent) to 5 (inadequate) after lectures following the concept of virtual inverted classroom compared to a historical control following the concept of physical inverted classroom. Box plots indicate median and interquartile range. Whiskers end with the lowest and highest data point within 1.5 × interquartile range. Means with their 95% CI intervals are represented as dotsBack to article page