condition mean min max ZT0-3 13.37415 13.37415 13.37415 ZT4-7 11.563185 11.563185 11.563185 ZT8-11 12.661349999999999 12.661349999999999 12.661349999999999 ZT12-15 13.44095 13.44095 13.44095 ZT16-19 15.0516 15.0516 15.0516 ZT20-23 9.641055 9.641055 9.641055