condition mean min max ZT0-3 4.68360509075 3.6820336160000005 5.6851765655 ZT4-7 6.056840355 5.381527546499999 6.7321531635000005 ZT8-11 8.962335791000001 8.1579097935 9.7667617885 ZT12-15 8.19008373575 8.011658375 8.368509096499999 ZT16-19 7.28770505025 6.207032030500001 8.368378069999999 ZT20-23 10.6876614965 8.969562943 12.405760050000001