condition mean min max ZT0-3 0.5167137817499999 0.204949114 0.8284784494999999 ZT4-7 1.46001550725 1.099007441 1.8210235735 ZT8-11 1.97080336475 1.8315538225 2.110052907 ZT12-15 2.58581939825 2.1741896709999997 2.9974491254999998 ZT16-19 2.056485972 1.8313559169999998 2.281616027 ZT20-23 3.3861273187500003 2.8817411125000003 3.8905135250000003