condition mean min max ZT0-3 173.462826 173.462826 173.462826 ZT4-7 203.88230950000002 203.88230950000002 203.88230950000002 ZT8-11 186.41103750000002 186.41103750000002 186.41103750000002 ZT12-15 118.56577899999999 118.56577899999999 118.56577899999999 ZT16-19 169.95064100000002 169.95064100000002 169.95064100000002 ZT20-23 166.2893375 166.2893375 166.2893375