condition mean min max ZT0-3 17.22755 16.29985 18.155250000000002 ZT4-7 12.411950000000001 12.411950000000001 12.411950000000001 ZT8-11 10.64573 10.64573 10.64573 ZT12-15 0 0 0 ZT16-19 15.254000000000001 15.254000000000001 15.254000000000001 ZT20-23 14.989650000000001 14.989650000000001 14.989650000000001