condition mean min max ZT0-3 164.522463 164.522463 164.522463 ZT4-7 203.07010200000002 203.07010200000002 203.07010200000002 ZT8-11 114.64717 114.64717 114.64717 ZT12-15 77.76763700000001 77.76763700000001 77.76763700000001 ZT16-19 47.822274 47.822274 47.822274 ZT20-23 56.246649 56.246649 56.246649