condition mean min max ZT0-3 3.9694800000000003 3.51161 4.427350000000001 ZT4-7 2.4656599999999997 2.4656599999999997 2.4656599999999997 ZT8-11 0.9569369999999999 0.9569369999999999 0.9569369999999999 ZT12-15 0 0 0 ZT16-19 3.068765 3.068765 3.068765 ZT20-23 3.90083 3.90083 3.90083