condition mean min max ZT0-3 0.60544792225 0.0 1.2108958445 ZT4-7 4.6597784145 3.0667790200000002 6.2527778089999995 ZT8-11 13.781034023250001 12.218050636500001 15.34401741 ZT12-15 21.02422574 18.64953384 23.39891764 ZT16-19 17.207365629999998 16.738476365 17.676254895 ZT20-23 21.83784597 18.702223699999998 24.973468240000003