I like that the visualization is interactive. And I also like that you have the bar chart below to show the number for each gender.

For your defined task T1, I think you can create an additional bar chart that just shows the number of patients in each work type (just like gender) and it will allow users to identify the number for work types more easily. Your insights are very interesting. Although the 3rd and 4th insight feels a bit hard to replicate.