condition mean min max ZT0-3 0.58919275 0.5006915000000001 0.677694 ZT4-7 0.383884 0.383884 0.383884 ZT8-11 0.5990315 0.5990315 0.5990315 ZT12-15 0 0 0 ZT16-19 0.45816500000000004 0.45816500000000004 0.45816500000000004 ZT20-23 0.586303 0.586303 0.586303