condition mean min max ZT0-3 26.897350000000003 16.63645 37.15825 ZT4-7 28.663600000000002 28.663600000000002 28.663600000000002 ZT8-11 15.27685 15.27685 15.27685 ZT12-15 0 0 0 ZT16-19 14.037020000000002 14.037020000000002 14.037020000000002 ZT20-23 16.66005 16.66005 16.66005