condition mean min max ZT0-3 27.572074999999998 24.64165 30.502499999999998 ZT4-7 13.74695 13.74695 13.74695 ZT8-11 14.8792 14.8792 14.8792 ZT12-15 0 0 0 ZT16-19 23.33695 23.33695 23.33695 ZT20-23 25.93935 25.93935 25.93935