condition mean min max ZT0-3 4.4770650000000005 3.886295 5.0678350000000005 ZT4-7 2.94758 2.94758 2.94758 ZT8-11 3.37982 3.37982 3.37982 ZT12-15 0 0 0 ZT16-19 5.099495 5.099495 5.099495 ZT20-23 3.4556050000000003 3.4556050000000003 3.4556050000000003