condition mean min max ZT0-3 25.214994 25.214994 25.214994 ZT4-7 63.718585000000004 63.718585000000004 63.718585000000004 ZT8-11 60.995928 60.995928 60.995928 ZT12-15 33.627539999999996 33.627539999999996 33.627539999999996 ZT16-19 19.790936000000002 19.790936000000002 19.790936000000002 ZT20-23 18.768811499999998 18.768811499999998 18.768811499999998