condition mean min max ZT0-3 10.006509999999999 10.006509999999999 10.006509999999999 ZT4-7 7.9709900000000005 7.9709900000000005 7.9709900000000005 ZT8-11 7.377815 7.377815 7.377815 ZT12-15 8.507545 8.507545 8.507545 ZT16-19 12.1949 12.1949 12.1949 ZT20-23 10.33445 10.33445 10.33445