condition mean min max ZT0-3 0.88251286875 0.618831235 1.1461945025 ZT4-7 2.292661906 2.1901142995000003 2.3952095125 ZT8-11 4.848482589 3.6124647075 6.0845004705 ZT12-15 11.591725042 10.520042999 12.663407085 ZT16-19 12.897373015 12.27640954 13.51833649 ZT20-23 10.21707322075 8.8107992065 11.623347235