condition mean min max ZT0-3 6.4105025 4.554915 8.26609 ZT4-7 2.847375 2.847375 2.847375 ZT8-11 1.297445 1.297445 1.297445 ZT12-15 0 0 0 ZT16-19 5.61545 5.61545 5.61545 ZT20-23 3.9951300000000005 3.9951300000000005 3.9951300000000005