condition mean min max ZT0-3 0.53032505725 0.44525075700000005 0.6153993575 ZT4-7 1.1720417517500001 0.448369366 1.8957141375000002 ZT8-11 4.604031503750001 3.3540059925000003 5.854057015 ZT12-15 3.946270492 3.812703892 4.079837092 ZT16-19 0.86411102075 0.367904255 1.3603177865 ZT20-23 0.2422311915 0.1930800415 0.29138234150000003