condition mean min max ZT0-3 34.33565 34.01795 34.65335 ZT4-7 22.965899999999998 22.965899999999998 22.965899999999998 ZT8-11 27.19905 27.19905 27.19905 ZT12-15 0 0 0 ZT16-19 40.1589 40.1589 40.1589 ZT20-23 34.5021 34.5021 34.5021