condition mean min max ZT0-3 7.28379992525 7.1209462585 7.4466535920000005 ZT4-7 5.336522404249999 4.685389090999999 5.9876557175 ZT8-11 4.93768091175 4.513983773 5.3613780505 ZT12-15 4.9945095322499995 4.2508719425 5.738147122 ZT16-19 8.988824040499999 7.303319429 10.674328652 ZT20-23 14.1050952475 14.091660605 14.11852989