condition mean min max ZT0-3 0.36720875 0.304168 0.43024949999999995 ZT4-7 3.17922 3.17922 3.17922 ZT8-11 3.512555 3.512555 3.512555 ZT12-15 0 0 0 ZT16-19 1.89481 1.89481 1.89481 ZT20-23 1.36867 1.36867 1.36867