If you look at the bar chart, you will see: 1. this third is much smaller than the first and second, 2. other categories are carefully divided small categories.

If you look at the bar chart, you will see: 1. this third is much smaller than the first and second, 2. other categories are carefully divided small categories. The "third" is not a meaningful comparison. A meaningful one should be the percentage of medical errors among medical treatments.