condition mean min max ZT0-3 15.912125 14.876249999999999 16.948 ZT4-7 10.094899999999999 10.094899999999999 10.094899999999999 ZT8-11 9.94628 9.94628 9.94628 ZT12-15 0 0 0 ZT16-19 13.50145 13.50145 13.50145 ZT20-23 16.74935 16.74935 16.74935