condition mean min max ZT0-3 8.8938125 4.403074999999999 13.38455 ZT4-7 4.394895 4.394895 4.394895 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 4.3865300000000005 4.3865300000000005 4.3865300000000005 ZT20-23 2.195065 2.195065 2.195065