condition mean min max ZT0-3 2.3339717079448334 1.4793901238345 3.43007 ZT4-7 0.58976 0.58976 0.58976 ZT8-11 1.5083950000000002 1.5083950000000002 1.5083950000000002 ZT12-15 1.5322325 0.504415 2.5600500000000004 ZT16-19 1.821945 1.821945 1.821945 ZT20-23 4.863115 4.863115 4.863115