condition mean min max ZT0-3 18.501899 18.501899 18.501899 ZT4-7 15.488752999999999 15.488752999999999 15.488752999999999 ZT8-11 15.419369 15.419369 15.419369 ZT12-15 17.026687 17.026687 17.026687 ZT16-19 14.901577 14.901577 14.901577 ZT20-23 14.770595499999999 14.770595499999999 14.770595499999999