condition mean min max ZT0-3 3.783325433 3.345040471 4.221610395 ZT4-7 2.65187704525 2.2011179135 3.102636177 ZT8-11 3.6568400199999997 3.1721235585 4.141556481499999 ZT12-15 5.605889256 4.2772239465 6.9345545655 ZT16-19 5.29544059775 4.4737565985 6.117124597 ZT20-23 9.350357833 7.718176951 10.982538715