condition mean min max ZT0-3 9.605429739249999 8.5224302085 10.68842927 ZT4-7 13.3630906335 8.829465422 17.896715845 ZT8-11 29.5299726775 24.65115558 34.408789775 ZT12-15 24.200344735 21.605961625 26.794727845 ZT16-19 19.894403912500003 18.208464505000002 21.58034332 ZT20-23 27.17948338 25.34583705 29.01312971