Green row means that the map plays good and well, with no missing assets. Yellow row means that the map has no missing assets, but there's something blocking it from reaching 100% compatibility. Red row means there are no download links for that map.
M.T. stands for Missing Textures or Shaders. "M" means "Many textures missing" (which may cause the map to be ugly or barely playable), and "F" means "Few textures missing" (which are just a minor annoyance which does not ruin the map too much). A dot stands for "none".
M.S. stands for Missing Sounds. A dot stands for "none".
Gametype are the standard OA gametypes it supports ( FFA, Team Deathmatch, Tournament, Capture The Flag, One Flag CTF, Harvester and Overload). Any other supported gametypes must go in the "Notes" field.
Notes field can be used for example to point out missing .arena or .aas files, or the presence in the package of stuff (textures, shaders, sounds, etc.) which may override existing assets from OA. Really major problems, such as overriding OA main arenas.txt file, may be pointed out using bold.
Version refers to the OpenArena version used for testing.
Empty fields mean that they have not been tested yet.
Useful infos about how to consider/manage the stuff in this page are listed in the Map compatibility page.
If you want to test maps, it is recommended to set a different folder (i.e. OpenArena/compatibility) and then download the Compatibility Test Dummy File, which prevents certain confusing messages to appear in the screen at all. Once that's set you can throw your Q3 maps and test them.
↑OpenArena installation used for testing should be vanilla (in both homepath -config/autodownload folder- and basepath -installation folder-), with only those .pk3 files contained in "stock" OA, plus the map you are testing in that exact moment, of course. Especially, it must not contain third-party "q3a2oa compatibilty packs".