condition mean min max ZT0-3 5.32011 3.126915 7.16725 ZT4-7 2.255915 2.255915 2.255915 ZT8-11 4.0426649999999995 4.0426649999999995 4.0426649999999995 ZT12-15 6.39033 6.019715 6.7609449999999995 ZT16-19 6.144525 6.144525 6.144525 ZT20-23 9.375495 9.375495 9.375495