condition mean min max ZT0-3 309.89988 309.89988 309.89988 ZT4-7 304.2531735 304.2531735 304.2531735 ZT8-11 306.02435449999996 306.02435449999996 306.02435449999996 ZT12-15 287.02536050000003 287.02536050000003 287.02536050000003 ZT16-19 272.010386 272.010386 272.010386 ZT20-23 297.0665485 297.0665485 297.0665485