condition mean min max ZT0-3 4.119809999999999 3.3420199999999998 4.8976 ZT4-7 3.474 3.474 3.474 ZT8-11 3.28891 3.28891 3.28891 ZT12-15 5.109835416666666 4.5289575 5.690713333333333 ZT16-19 3.748 3.09723 4.39877 ZT20-23 0 0 0