condition mean min max ZT0-3 5.941034999999999 5.0117449999999995 6.870325 ZT4-7 1.1438395 1.1438395 1.1438395 ZT8-11 0.423882 0.423882 0.423882 ZT12-15 0 0 0 ZT16-19 0.5331595 0.5331595 0.5331595 ZT20-23 2.740865 2.740865 2.740865