condition mean min max ZT0-3 25.77325 16.33895 30.71815 ZT4-7 14.938749999999999 14.938749999999999 14.938749999999999 ZT8-11 15.042200000000001 15.042200000000001 15.042200000000001 ZT12-15 19.29825 18.76215 19.83435 ZT16-19 19.588700000000003 19.588700000000003 19.588700000000003 ZT20-23 27.0619 27.0619 27.0619