condition mean min max ZT0-3 1.2873438242500002 1.1420933385 1.43259431 ZT4-7 1.42660152575 1.2787054485 1.574497603 ZT8-11 0.8979805124999999 0.7693685159999999 1.0265925089999999 ZT12-15 1.27123700875 0.7310843025 1.8113897150000002 ZT16-19 1.9009654449999998 1.6176815875 2.1842493024999996 ZT20-23 4.57638321825 3.5742841055000003 5.578482331