condition mean min max ZT0-3 9.448452499999998 9.236104999999998 9.6608 ZT4-7 7.948135 7.948135 7.948135 ZT8-11 7.40726 7.40726 7.40726 ZT12-15 0 0 0 ZT16-19 7.36789 7.36789 7.36789 ZT20-23 9.979165 9.979165 9.979165