Create a single dimension table combining all attributes (age, gender, treatment type) and establish a many-to-one relationship with the fact table, to simplify the model.

Create separate dimension tables for each attribute (age, gender, treatment type) and establish many-to-one relationships with the fact table, ensuring each dimension can be independently related to the fact table.

Implement a bridge table to establish a many-to-many relationship between the fact table and each dimension table, to accommodate complex queries.

Ignore the relationships and treat each dimension as a separate entity, to reduce complexity in the data model.