condition mean min max ZT0-3 2.30134025 1.3623355 3.2403449999999996 ZT4-7 4.40446 4.40446 4.40446 ZT8-11 4.651045 4.651045 4.651045 ZT12-15 0 0 0 ZT16-19 1.87674 1.87674 1.87674 ZT20-23 2.698325 2.698325 2.698325