condition mean min max ZT0-3 12.546158399500001 11.228500899 13.863815900000002 ZT4-7 8.23305656 7.418544460000001 9.04756866 ZT8-11 13.391961205 11.490856075 15.293066334999999 ZT12-15 13.383484615 12.58523809 14.18173114 ZT16-19 11.921168592499999 10.607279535 13.23505765 ZT20-23 10.9852105175 9.53740161 12.433019425