condition mean min max ZT0-3 1.1176050000000002 1.1176050000000002 1.1176050000000002 ZT4-7 0.6757044999999999 0.6757044999999999 0.6757044999999999 ZT8-11 0.999789 0.999789 0.999789 ZT12-15 1.506965 1.506965 1.506965 ZT16-19 2.507775 2.507775 2.507775 ZT20-23 1.3912200000000001 1.3912200000000001 1.3912200000000001