condition mean min max ZT0-3 8.1858825 7.77375 8.598015 ZT4-7 4.597395000000001 4.597395000000001 4.597395000000001 ZT8-11 2.324465 2.324465 2.324465 ZT12-15 0 0 0 ZT16-19 4.3610050000000005 4.3610050000000005 4.3610050000000005 ZT20-23 5.78674 5.78674 5.78674