condition mean min max ZT0-3 14.877025 14.742899999999999 15.01115 ZT4-7 20.738149999999997 20.738149999999997 20.738149999999997 ZT8-11 23.60125 23.60125 23.60125 ZT12-15 0 0 0 ZT16-19 19.85805 19.85805 19.85805 ZT20-23 17.09525 17.09525 17.09525