condition mean min max ZT0-3 12.819418333333333 6.079605 16.44225 ZT4-7 0.7624955 0.7624955 0.7624955 ZT8-11 1.360495 1.360495 1.360495 ZT12-15 2.9879625 2.508825 3.4671 ZT16-19 3.228535 3.228535 3.228535 ZT20-23 7.284034999999999 7.284034999999999 7.284034999999999