condition mean min max ZT0-3 11.359333 11.359333 11.359333 ZT4-7 11.896315000000001 11.896315000000001 11.896315000000001 ZT8-11 10.673112499999998 10.673112499999998 10.673112499999998 ZT12-15 11.6743735 11.6743735 11.6743735 ZT16-19 10.605353000000001 10.605353000000001 10.605353000000001 ZT20-23 13.37091 13.37091 13.37091