condition mean min max ZT0-3 0.6541333447500001 0.23446715399999998 1.0737995355 ZT4-7 6.3971333265 4.659147589 8.135119064 ZT8-11 6.50616602875 6.240070917000001 6.7722611404999995 ZT12-15 25.5810830965 17.574036147999998 33.588130045 ZT16-19 33.524165047500006 25.895786805 41.152543290000004 ZT20-23 100.7107277825 60.941182255 140.48027331