condition mean min max ZT0-3 9.577898 9.577898 9.577898 ZT4-7 10.056031 10.056031 10.056031 ZT8-11 9.174819 9.174819 9.174819 ZT12-15 10.259492999999999 10.259492999999999 10.259492999999999 ZT16-19 10.0027615 10.0027615 10.0027615 ZT20-23 10.553134499999999 10.553134499999999 10.553134499999999