condition mean min max ZT0-3 18.777970833333335 10.559508333333333 26.996433333333332 ZT4-7 437.339 437.339 437.339 ZT8-11 404.28700000000003 404.28700000000003 404.28700000000003 ZT12-15 66.87706 13.47162 120.2825 ZT16-19 2.29909 2.29909 2.29909 ZT20-23 4.58533 4.58533 4.58533