Protecting Sensitive Data in Custom Reports

What is the most effective way to provide managers with access to custom reports without exposing sensitive employee data, such as ethnicity, date of birth, home address, phone number etc. which are not currently visible in the manager self-service front end application. FYI- Managers inherit seeded Line manager and custom hiring manager role (removed BI author role).

We want to know how other companies are sharing reports with their managers.