condition mean min max ZT0-3 3.66401 3.43581 3.8922100000000004 ZT4-7 2.495945 2.495945 2.495945 ZT8-11 1.83618 1.83618 1.83618 ZT12-15 0 0 0 ZT16-19 1.91289 1.91289 1.91289 ZT20-23 3.2456699999999996 3.2456699999999996 3.2456699999999996