condition mean min max ZT0-3 15.530133333333334 11.981266666666667 19.079 ZT4-7 13.9288 13.9288 13.9288 ZT8-11 14.6638 14.6638 14.6638 ZT12-15 22.805875 18.679949999999998 26.9318 ZT16-19 23.438000000000002 21.9907 24.8853 ZT20-23 0 0 0