condition mean min max ZT0-3 10.9603825 7.799715 14.12105 ZT4-7 26.63625 26.63625 26.63625 ZT8-11 29.0559 29.0559 29.0559 ZT12-15 0 0 0 ZT16-19 22.1112 22.1112 22.1112 ZT20-23 23.879550000000002 23.879550000000002 23.879550000000002