condition mean min max ZT0-3 1268.309374 1268.309374 1268.309374 ZT4-7 1530.8909250000002 1530.8909250000002 1530.8909250000002 ZT8-11 1729.2916985000002 1729.2916985000002 1729.2916985000002 ZT12-15 2085.2977554999998 2085.2977554999998 2085.2977554999998 ZT16-19 1868.686596 1868.686596 1868.686596 ZT20-23 1833.4256125000002 1833.4256125000002 1833.4256125000002