condition mean min max ZT0-3 19.22555 19.22555 19.22555 ZT4-7 16.9255 16.9255 16.9255 ZT8-11 15.408349999999999 15.408349999999999 15.408349999999999 ZT12-15 15.8751 15.8751 15.8751 ZT16-19 17.1779 17.1779 17.1779 ZT20-23 18.923099999999998 18.923099999999998 18.923099999999998