condition mean min max ZT0-3 1365.385903 1365.385903 1365.385903 ZT4-7 1153.1020875 1153.1020875 1153.1020875 ZT8-11 882.5921559999999 882.5921559999999 882.5921559999999 ZT12-15 991.6086720000001 991.6086720000001 991.6086720000001 ZT16-19 894.0620095 894.0620095 894.0620095 ZT20-23 913.9373835 913.9373835 913.9373835