condition mean min max ZT0-3 0.5520445 0.5520445 0.5520445 ZT4-7 0.627347 0.627347 0.627347 ZT8-11 0.6943885000000001 0.6943885000000001 0.6943885000000001 ZT12-15 0.38182950000000004 0.38182950000000004 0.38182950000000004 ZT16-19 0.2784225 0.2784225 0.2784225 ZT20-23 0.3004875 0.3004875 0.3004875