condition mean min max ZT0-3 91.238601 91.238601 91.238601 ZT4-7 60.1415425 60.1415425 60.1415425 ZT8-11 77.6738795 77.6738795 77.6738795 ZT12-15 89.32059749999999 89.32059749999999 89.32059749999999 ZT16-19 176.448691 176.448691 176.448691 ZT20-23 222.506818 222.506818 222.506818