condition mean min max ZT0-3 4.377057349 3.854481274 4.899633424 ZT4-7 4.568671875 4.3742270895 4.7631166605 ZT8-11 4.02479959075 4.0211928925 4.028406289 ZT12-15 5.885612860749999 4.473035517 7.298190204499999 ZT16-19 9.298979393500002 8.404689183 10.193269604000001 ZT20-23 9.836872654250001 9.83310122 9.840644088500001