condition mean min max ZT0-3 6.931696512250001 5.93423569 7.929157334500001 ZT4-7 10.352962380249998 8.467597773 12.238326987499999 ZT8-11 17.454458275 14.879175075 20.029741475 ZT12-15 21.595145567499998 21.190981425 21.99930971 ZT16-19 13.720059769999999 13.347766069999999 14.092353469999999 ZT20-23 14.254167724999999 14.11330973 14.39502572