condition mean min max ZT0-3 426.8311111 426.8311111 426.8311111 ZT4-7 482.26277780000004 482.26277780000004 482.26277780000004 ZT8-11 627.6388889 627.6388889 627.6388889 ZT12-15 569.1300000333333 569.1300000333333 569.1300000333333 ZT16-19 529.1988888999999 529.1988888999999 529.1988888999999 ZT20-23 566.2677777666667 566.2677777666667 566.2677777666667