condition mean min max ZT0-3 0.6631044162499999 0.4207770355 0.905431797 ZT4-7 0.8300011755 0.5293626855 1.1306396655 ZT8-11 2.24259586025 1.6848342375 2.800357483 ZT12-15 2.9383807775 2.605585321 3.2711762339999995 ZT16-19 1.5921211472499999 1.5050543809999999 1.6791879135 ZT20-23 1.738870156 1.575741786 1.9019985259999999