Is It "Above-Median" or "Over-Median"? "Below-Median" or "Under-Median"?

I find myself switching back and forth when I make comments about some of the new BAPCPA provisions.  So I did a google search-analysis-study with " at each end and here are my official findings"

"Above-Median" - 476,000 hits; "Over-Median" -13,200 hits; 

"Below-Median" - 475,000 hits; "Under-Median" - 4,450 hits

The code uses "greater than the median" without hyphens by the way.