condition mean min max ZT0-3 1.6240325 1.2561499999999999 1.991915 ZT4-7 2.06546 2.06546 2.06546 ZT8-11 2.10963 2.10963 2.10963 ZT12-15 0 0 0 ZT16-19 4.5904050000000005 4.5904050000000005 4.5904050000000005 ZT20-23 2.796925 2.796925 2.796925