condition mean min max ZT0-3 2.9453750000000003 2.9453750000000003 2.9453750000000003 ZT4-7 1.3082 1.3082 1.3082 ZT8-11 1.74389 1.74389 1.74389 ZT12-15 2.553385 2.553385 2.553385 ZT16-19 6.06388 6.06388 6.06388 ZT20-23 3.1517549999999996 3.1517549999999996 3.1517549999999996