condition mean min max ZT0-3 13.71 13.71 13.71 ZT4-7 10.715499999999999 10.715499999999999 10.715499999999999 ZT8-11 9.395655 9.395655 9.395655 ZT12-15 10.193645 10.193645 10.193645 ZT16-19 14.56925 14.56925 14.56925 ZT20-23 13.07015 13.07015 13.07015