condition mean min max ZT0-3 2.57850681875 1.646660126 3.5103535115 ZT4-7 4.71191282675 4.375530104499999 5.0482955490000005 ZT8-11 3.2204794795 2.6226763665 3.8182825925 ZT12-15 0.7668146215 0.3828189965 1.1508102465 ZT16-19 0.16162930875 0.06867474400000001 0.2545838735 ZT20-23 0.1492006585 0.12938349799999999 0.169017819