condition mean min max ZT0-3 3.6519525 3.49438 3.809525 ZT4-7 1.4504869999999999 1.4504869999999999 1.4504869999999999 ZT8-11 1.04495 1.04495 1.04495 ZT12-15 0 0 0 ZT16-19 2.254525 2.254525 2.254525 ZT20-23 3.533725 3.533725 3.533725