condition mean min max ZT0-3 15.847549999999998 15.847549999999998 15.847549999999998 ZT4-7 14.135 14.135 14.135 ZT8-11 10.45995 10.45995 10.45995 ZT12-15 11.3468 11.3468 11.3468 ZT16-19 11.8914 11.8914 11.8914 ZT20-23 16.26625 16.26625 16.26625