Mike Meinzer & Dr. Jeremy Pettit recently published a meta-analysis on the co-occurence of ADHD and depression in Clinical Psychology Review. The study will be available online soon.
The full citation is included below:
Meinzer, M.C., Pettit, J.W., & Viswesvaran, C. (2014). The co-occurrence of Attention Deficit Hyperactivity Disorder and unipolar depression in children and adolescents: a meta-analytic review. Clinical Psychology Review, 34, 595-607.