condition mean min max ZT0-3 83.85062 83.85062 83.85062 ZT4-7 105.8024275 105.8024275 105.8024275 ZT8-11 68.5101255 68.5101255 68.5101255 ZT12-15 126.80843399999999 126.80843399999999 126.80843399999999 ZT16-19 91.58042449999999 91.58042449999999 91.58042449999999 ZT20-23 227.4512225 227.4512225 227.4512225