Keyword status is based on your CTR rate only on G's site. Partner and content sites don't matter. There is no way to see your exact ctr on G's site alone. So if you get a 10% CTR rate at AOL, but only a 0.3% on G, your work will be listed 'at risk' even though your overall CTR rate could be quite high.
0.5% is the benchmark for first place, the necessary CTR for other positions is slightly lower.