condition mean min max ZT0-3 168.936745 168.936745 168.936745 ZT4-7 175.842712 175.842712 175.842712 ZT8-11 175.9264215 175.9264215 175.9264215 ZT12-15 150.373168 150.373168 150.373168 ZT16-19 165.43037600000002 165.43037600000002 165.43037600000002 ZT20-23 164.7562495 164.7562495 164.7562495