condition mean min max ZT0-3 9.17596276175 7.2045039735 11.14742155 ZT4-7 2.9385760677499997 2.6207172754999997 3.25643486 ZT8-11 0.9399946175 0.4892187575 1.3907704775 ZT12-15 0.7776766294999999 0.5091367014999999 1.0462165575 ZT16-19 1.04288844825 0.7672018315 1.318575065 ZT20-23 2.4085168572500004 1.574916564 3.2421171505000004