condition mean min max ZT0-3 20.09715 15.35525 24.83905 ZT4-7 26.583199999999998 26.583199999999998 26.583199999999998 ZT8-11 13.1829 13.1829 13.1829 ZT12-15 0 0 0 ZT16-19 21.554049999999997 21.554049999999997 21.554049999999997 ZT20-23 30.18515 30.18515 30.18515