condition mean min max ZT0-3 90.31113333333333 51.74055 119.054 ZT4-7 36.838 36.838 36.838 ZT8-11 29.7917 29.7917 29.7917 ZT12-15 52.33875 43.95885 60.71865 ZT16-19 66.72675000000001 66.72675000000001 66.72675000000001 ZT20-23 109.41 109.41 109.41