condition mean min max ZT0-3 16.346316666666667 1.6305649999999998 44.3083 ZT4-7 7.707815 7.707815 7.707815 ZT8-11 2.8367899999999997 2.8367899999999997 2.8367899999999997 ZT12-15 5.74897225 1.2257544999999999 10.27219 ZT16-19 0.8704335 0.8704335 0.8704335 ZT20-23 1.07924 1.07924 1.07924