condition mean min max ZT0-3 1.79927996675 0.6240375165000001 2.9745224169999998 ZT4-7 1.5436113337500001 0.7290811530000001 2.3581415145 ZT8-11 4.72634057175 3.959603431 5.4930777125 ZT12-15 3.7957849005 2.5928184125000002 4.998751388500001 ZT16-19 1.97649033975 1.9202272735 2.032753406 ZT20-23 1.33741714775 0.7326359650000001 1.9421983305000001