What works for whom?

With so many interventions available for common mental health problems, clinicians may find themselves wondering how to best help their patients, and new patients may be overwhelmed by their options.  Does this child need medication for ADHD, or will behavioral therapy suffice? Will any therapist be able to help me overcome anxiety, or do I need a therapist who is similar to me?  Modern data analysis tools including machine learning can help us answer these questions.